CN112833453A - No. 0 high-voltage power supply optimization control system based on multi-data judgment - Google Patents
No. 0 high-voltage power supply optimization control system based on multi-data judgment Download PDFInfo
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- CN112833453A CN112833453A CN202110001782.0A CN202110001782A CN112833453A CN 112833453 A CN112833453 A CN 112833453A CN 202110001782 A CN202110001782 A CN 202110001782A CN 112833453 A CN112833453 A CN 112833453A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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Abstract
The invention relates to a No. 0 high heating optimization control system based on multi-data judgment, which comprises 4 control levels, namely a heating pipe control level, an environment-friendly control level, an economic control level and a primary frequency modulation control level, realizes the automatic operation of the No. 0 high heating whole process after a unit is started and connected with a grid through the 4 control levels, realizes the heating pipe control, the environment-friendly control, the economic control and the primary frequency modulation control optimization of the No. 0 high heating according to the thermal control measurement values of 0 pumping pressure, 0 pumping temperature, 0 high heating outlet temperature, 0 pumping pipeline upper and lower wall temperature, 0 high heating steam pressure, unit load and primary frequency modulation slip signal, improves the coal economizer outlet smoke temperature, greatly improves the environmental protection level of the unit, maximally improves the economic performance of the unit, and basically meets the small disturbance requirement of the frequency modulation load, thereby ensuring that different control targets are realized at different stages of the operation of the No. 0 high heating unit, the maximum economic value of the unit is realized from three aspects of energy conservation, environmental protection and frequency modulation.
Description
Technical Field
The invention relates to the technical field of automatic control of thermal power plants, in particular to a No. 0 high-voltage power supply optimization control system based on multi-data judgment.
Background
Due to the increasing requirements on energy conservation, emission reduction and environmental protection, the application of new energy-saving and environment-friendly technologies is particularly emphasized when power generation groups in China build and expand thermal power generating units. The No. 0 high-pressure heater (No. 0 high heater) is a new technology with energy-saving and emission-reducing benefits, can improve the denitration inlet smoke temperature at low load, meets the SCR catalyst activity temperature in a wider range, can improve the feed water temperature of partial load, and can be used together with a low-temperature economizer, so that the economical efficiency of a unit is improved to the greatest extent.
At present, a power plant with 0 # Gaocao is put into operation in China, the integral operation effect of 0 # Gaocao is poor, and the following problems mainly exist: the temperature rise of the pipeline is not well controlled during operation, and the phenomenon of large pipeline vibration occurs; no. 0 high plus no in-depth economic analysis was performed; no. 0 high plus contribution to environmental protection is not found and analyzed; the high-plus-0 primary frequency modulation capability was not tested and applied.
How to realize the economic function, the environmental protection function and the primary frequency modulation function of the 0 # high gain, and the maximum function of realizing the 0 # high gain is the problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above situation, to overcome the defects of the prior art, the present invention aims to provide a number 0 high-pressure-increasing optimization control system based on multiple data judgment, so as to ensure that different control targets are realized at different stages of the number 0 high-pressure-increasing unit operation, and the maximum economic value of the unit is realized from three aspects of energy saving, environmental protection and frequency modulation.
The technical scheme of the invention is as follows:
a0 # high heating optimization control system based on multi-data judgment comprises 4 control levels which are respectively a heating pipe control level, an environment-friendly control level, an economic control level and a primary frequency modulation control level, the automatic operation of the 0 # high heating whole process after a unit is started and connected to the grid is realized through the 4 control levels, and the 0 # high heating control, the environment-friendly control, the economic control and the primary frequency modulation control optimization are realized according to heat control measurement values of 0 pumping pressure, 0 pumping temperature, 0 # high heating outlet temperature, 0 pumping pipeline upper and lower wall temperature, 0 # high heating steam inlet pressure, unit load and primary frequency modulation slip signals, so that the optimal economic performance of the 0 # high heating is achieved;
wherein:
the heating pipe control level: before the high pressure heater is put into operation at No. 0, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is slowly increased by controlling the opening degree of a main regulating valve of the 0-pumping pipeline, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is less than 3 ℃/min to serve as the control speed of the heating pipe, when the temperature of the high pressure inlet steam at No. 0 is close to the temperature of the 0-pumping pipeline, the heating pipe is finished, and the heating pipe control mode of the high pressure heater at No.;
environmental protection control level: before the unit is connected to the grid, the high heater No. 0 is put in, and the water supply temperature of the unit is improved by the operation of the high heater No. 0, so that the smoke temperature at the outlet of the economizer is improved, the smoke temperature at the inlet of the SCR is improved, the operation condition of the SCR is met, the load range of the operation of a denitration system is expanded, and the environmental protection level of the unit is greatly improved;
and (3) economic control level: according to the unit load and the outlet temperature of the high pressure heater No. 0, the optimal operation high pressure control pressure No. 0 is set according to the optimal high pressure operation curve No. 0, so that the economic performance of the unit is improved to the maximum extent;
primary frequency modulation control level: through the change of the opening degree of the main throttle valve with the number 0 being increased, the 0 steam extraction pressure is instantaneously changed, the load response capacity of the unit is enhanced, and the primary frequency modulation capacity of the unit is improved.
Preferably, the specific control method of the heating pipe control stage is as follows:
before the high-temperature operation of No. 0, slowly raising the temperature of the upper wall and the lower wall of the 0-pumping pipeline by controlling the opening degree of a valve of the 0-pumping pipeline bypass heating pipe system, and taking the temperature of the upper wall and the lower wall of the 0-pumping pipeline which is less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is less than 3 ℃, the opening degree of the bypass valve of the heating pipe is increased by 1%;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is greater than 3 ℃, the opening degree of the bypass valve of the heating pipe is reduced by 1%;
when the temperature value of the upper wall and the lower wall of the pipeline is greater than 200 ℃ at 0, the bypass heating pipe is finished, and the bypass door adjusting instruction of the heating pipe is automatically set to 25%;
slowly opening a No. 0 high steam-feeding main regulating valve, and taking the temperature of the upper wall and the lower wall of a 0-pumping pipeline less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is less than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is increased by 1 percent;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is greater than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is reduced by 1 percent;
when the deviation between the upper and lower wall temperature values of the 0 pumping pipeline and the 0 high steam inlet temperature value is +/-20 ℃, the upper and lower wall temperatures of the 0 high steam inlet pipeline are determined to be close to the steam inlet temperature, the main heating pipe is finished, and the heating pipe mode is automatically cut off.
Preferably, the setting of the optimal operation 0 # high pressure control pressure in the economic control level according to the optimal 0 # high pressure operation curve specifically comprises: when the primary frequency modulation of the unit does not act, the unit No. 0 high-pressure valve position of the high-pressure main regulating valve is controlled according to a fitting curve formula corresponding to the optimal control curve of the steam pressure of the high-pressure inlet of the No. 0 unit, and the fitting curve formula is as follows:
f(p)＝-0.00000003*w3+0.00003068*w2-0.00271022*w+5.09695863
wherein: w is more than or equal to 330MW and less than or equal to 520 MW;
p is 0 # high inlet pressure; and w is the unit load.
4. The multiple data judgment-based # 0 hga optimization control system of claim 1, wherein the specific control method of the primary frequency modulation control stage is as follows:
under the little disturbance condition of unit primary control, through the aperture that changes the main governing door that 0 # increases earlier, 0 steam extraction flow of instantaneous change strengthens the load response ability of unit, if 0 # increases the change and can't satisfy primary control's requirement, then through the change of unit flow gross order, compensate the not enough problem of 0 # increases primary control ability, specifically do:
fitting to obtain a function of the opening degree and the slip of the No. 0 high plus main damper under the working conditions of 520MW, 430MW, 360MW and 330MW through a relation curve of the opening degree and the slip of the No. 0 high plus main damper, and obtaining a function relation of the opening degree of the No. 0 high plus damper corresponding to the slip under the working conditions of 50% -80% THA through a fitting curve function and an interpolation method:
k1＝-0.0170×rc 5+0.2296×rc 4-1.3849×rc 3+3.6856×rc 2-10.0132×rc+70.7628
k2＝-0.2136×rc 5+3.5354×rc 4-23.1467×rc 3+74.2216×rc 2-121.5501×rc+144.6477
k3＝0.0576×rc 5-1.1286×rc 4+8.0592×rc 3-26.6014×rc 2+34.2508×rc+55.0269
in the formula: k is a radical of1-520MW operating mode No. 0 plus main regulating opening,%;
k2430MW working condition No. 0 high plus main regulating valve opening degree,%;
k3-360MW operating condition No. 0 plus main regulating valve opening,%;
rc-turbine slip (negative), r/min;
rc≤4.8。
when the load of the unit is more than 430MW and less than or equal to 520MW, the opening function relationship of the 0-degree high plus regulating valve is as follows:
k＝k1+(w-430)/2*(k1-k2)
when the load of the unit is more than 360MW and less than or equal to 430MW, the opening function relationship of the 0-number high plus regulating valve is as follows:
k＝k2+(w-360)/2*(k2-k3)
when the load of the unit is not less than 330MW and not more than 360MW, the opening function relationship of the No. 0 high plus regulating valve is as follows:
k＝k3
when the load of the unit is under the working condition of 330-520 MW and the primary frequency modulation is small in disturbance, the 0 # high plus main regulating gate can directly correspondingly calculate the valve position instruction corresponding to the 0 # high plus main regulating gate through the slip limit number according to the above functional relation, so that the response lag time of the primary frequency modulation is reduced, and the frequency modulation load meets the small disturbance requirement.
According to the invention, the automatic operation of the whole process of No. 0 high heating after the unit is started and connected to the grid is realized through four control levels, the heating pipe control, the environmental protection control, the economic control and the primary frequency modulation control optimization of No. 0 high heating are realized according to the heat control measurement values of 0 pumping pressure, 0 pumping temperature, 0 high heating outlet temperature, 0 pumping pipeline upper and lower wall temperature, 0 high heating steam inlet pressure, unit load and primary frequency modulation slip signals, and the heating pipe control mode of the heater is optimized through the heating pipe control level; the number 0 is input before the unit is connected to the grid through the environment-friendly control level, the water supply temperature of the unit is improved, so that the smoke temperature at the outlet of the economizer is improved, the smoke temperature at the inlet of the SCR is improved, the operating condition of the SCR is met, the load range of the operation of a denitration system is expanded, and the environment-friendly level of the unit is greatly improved; the optimal operation No. 0 high pressure control pressure is set according to the optimal No. 0 high pressure operation curve through the economic control level, so that the economic performance of the unit is improved to the maximum extent; through a primary frequency modulation control level, when the unit load is under a working condition of 330-520 MW and the primary frequency modulation is small in disturbance, the valve position instruction corresponding to the 0 # high-plus main regulating gate can be directly obtained through the slip limit number according to the functional relation, so that the primary frequency modulation response lag time can be less than 3s, the frequency modulation load basically meets the small disturbance requirement, different control targets are realized at different stages of the 0 # high-plus unit operation, and the maximum economic value of the unit is realized from three aspects of energy conservation, environmental protection and frequency modulation.
Drawings
FIG. 1 is a simplified control logic diagram for a high-rise heating pipe No. 0 according to the present invention;
FIG. 2 is a SCR inlet temperature variation curve during the start-up of the unit of the present invention;
FIG. 3 is a graph of optimal control of high feed inlet pressure for the invention No. 0;
FIG. 4 is a diagram showing the relationship between the opening of the No. 0 plus main governor and the slip according to the present invention;
FIG. 5 is a graph showing the variation of the differential load under different operating conditions according to the present invention;
FIG. 6 is a logic diagram of the control function of the 0 # high plus primary frequency modulation according to the present invention;
fig. 7 is a general schematic diagram of the number 0 high-voltage optimization control system of the invention.
Detailed Description
The following examples further illustrate the embodiments of the present invention in detail.
The invention relates to a No. 0 high-pressure heater optimization control system based on multi-data judgment, which comprises 4 control levels, namely a heating pipe control level, an environment-friendly control level, an economic control level and a primary frequency modulation control level, the whole-course automatic operation of 0 # high voltage heater (0 # high voltage heater for short 0 # high voltage heater) after the unit is started and connected with the grid is realized through 4 control levels, according to heat control measurement values of 0 pumping pressure (0 section of pumping pressure is abbreviated as '0 pumping pressure'), 0 pumping temperature (0 section of pumping temperature is abbreviated as '0 pumping temperature'), 0 # high heating outlet temperature, 0 pumping pipeline (0 section of pumping pipeline is abbreviated as '0 pumping pipeline'), upper and lower wall temperature, 0 # high heating steam inlet pressure, unit load and primary frequency modulation slip signal, the optimization of 0 # high heating pipe control, environmental protection control, economic control and primary frequency modulation control is realized, and the optimal economic performance of 0 # high heating is achieved;
wherein:
heating control stage (heating mode): before the high pressure heater is put into operation at No. 0, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is slowly increased by controlling the opening degree of a main regulating valve of the 0-pumping pipeline, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is less than 3 ℃/min to serve as the control speed of the heating pipe, when the temperature of the high pressure inlet steam at No. 0 is close to the temperature of the 0-pumping pipeline, the heating pipe is finished, and the heating pipe control mode of the high pressure heater at No.;
level of environmental control (environmental mode): before the unit is connected to the grid, the high heater No. 0 is put in, and the water supply temperature of the unit is improved by the operation of the high heater No. 0, so that the smoke temperature at the outlet of the economizer is improved, the smoke temperature at the inlet of the SCR is improved, the operation condition of the SCR is met, the load range of the operation of a denitration system is expanded, and the environmental protection level of the unit is greatly improved;
economic control level (economic mode): according to the unit load and the outlet temperature of the high pressure heater No. 0, the optimal operation high pressure control pressure No. 0 is set according to the optimal high pressure operation curve No. 0, so that the economic performance of the unit is improved to the maximum extent;
primary frequency modulation control stage (frequency modulation mode): through the change of the opening degree of the main throttle valve with the number 0 being increased, the 0 steam extraction pressure is instantaneously changed, the load response capacity of the unit is enhanced, and the primary frequency modulation capacity of the unit is improved.
In order to ensure the use effect, the specific control method of the heating pipe control level comprises the following steps:
before the high-temperature operation of No. 0, slowly raising the temperature of the upper wall and the lower wall of the 0-pumping pipeline by controlling the opening degree of a valve of the 0-pumping pipeline bypass heating pipe system, and taking the temperature of the upper wall and the lower wall of the 0-pumping pipeline which is less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is less than 3 ℃, the opening degree of the bypass valve of the heating pipe is increased by 1%;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is greater than 3 ℃, the opening degree of the bypass valve of the heating pipe is reduced by 1%;
when the temperature value of the upper wall and the lower wall of the pipeline is greater than 200 ℃ at 0, the bypass heating pipe is finished, and the bypass door adjusting instruction of the heating pipe is automatically set to 25%;
slowly opening a No. 0 high steam-feeding main regulating valve, and taking the temperature of the upper wall and the lower wall of a 0-pumping pipeline less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is less than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is increased by 1 percent;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is greater than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is reduced by 1 percent;
when the deviation between the upper and lower wall temperature values of the 0 pumping pipeline and the 0 high steam inlet temperature value is +/-20 ℃, the upper and lower wall temperatures of the 0 high steam inlet pipeline are determined to be close to the steam inlet temperature, the main heating pipe is finished, and the heating pipe mode is automatically cut off.
As shown in fig. 1, which is a simplified control logic diagram of the high-pressure heating pipe No. 0, the heating pipe control level heating pipe mode is generally applied to the startup of a unit and the operation after the high-pressure heating cutting of No. 0, under any circumstances, when the high-pressure steam feeding pressure of No. 0 exceeds 7.835MPa, the 0-pumping main regulating valve is closed until the high-pressure steam feeding pressure of No. 0 is less than 7.835MPa, the 0-pumping main regulating valve is kept still, and the heating pipe control mode is interrupted.
In an environment-friendly mode of an environment-friendly control level, a unit is started, when the rotating speed of a steam turbine is 500r/min in a cylinder warming stage, the pumping pressure of 0 is 0.4-0.6 MPa, and the feeding pressure of 0 is high, and the feeding temperature is increased by about 6-15 ℃ due to the low feeding pressure and flow of 0; when the turbine is at a constant speed of 3000r/min, the 0-pumping pressure is about 1.5-1.7 MPa, and the water supply temperature is increased by about 17-25 ℃; after the unit is connected to the power grid, the water supply temperature is increased by about 22-31 ℃ along with the increase of 0 pumping pressure and load, the increase range is increased firstly and then reduced, and the load is increased to the maximum extent about 200 MW. Because the time required by the unit from grid connection to load increase of 330MW is about 110min, the steam extraction heat recovery system needs a heating pipe, part of the high-pressure system is not normally put into operation, and the whole situation shows that the No. 0 high-pressure system is switched from flushing to the working condition with 50% THA, the final water supply temperature can be increased to 15-31 ℃, the SCR inlet temperature can be increased by 8-16 ℃ (shown in figure 2), the denitration input load can be advanced to 200MW from 280MW without the No. 0 high-pressure system, namely, the water supply temperature of the unit is increased, so that the coal economizer outlet smoke temperature is increased, the SCR inlet smoke temperature is increased, the operation condition of the SCR is met, the load range of the denitration system is expanded, and the environmental protection level of the unit is greatly increased.
According to an optimal 0 # high pressure operation curve in the economic control level, the optimal operation 0 # high pressure control pressure is specifically set as follows: when the primary frequency modulation of the unit does not act, the unit No. 0 high-pressure valve position of the high-pressure main regulating valve is controlled according to a fitting curve formula corresponding to the optimal control curve of the steam pressure of the high-pressure inlet of the No. 0 unit, and the fitting curve formula is as follows:
f(p)＝-0.00000003*w3+0.00003068*w2-0.00271022*w+5.09695863
wherein: w is more than or equal to 330MW and less than or equal to 520 MW;
p is 0 # high inlet pressure; and w is the unit load.
As shown in fig. 3, the optimal control curve is a 0 # high admission pressure optimal control curve, the heat rate of the unit is reduced along with the increase of the 0 # high admission pressure (i.e. the final feed water temperature of the unit) under various working conditions, and because the 0 # high admission pressure is limited by the constraint condition, the heat rate of the unit is gradually reduced along with the increase of the 0 # high admission pressure, and meanwhile, the influence of the increase of the 0 # high admission pressure on the heat rate of the unit load is smaller and smaller along with the reduction of the unit load. The valve position of the 0 # high pressure main regulating valve is controlled through a fitting curve formula corresponding to the optimal control curve, and the 0 # high pressure inlet steam pressure is adjusted, so that the 0 # high pressure outlet temperature is adjusted, and the economic performance of the unit is improved to the maximum extent.
The specific control method of the primary frequency modulation control level comprises the following steps:
under the little disturbance condition of unit primary control, through the aperture that changes the main governing door that 0 # increases earlier, 0 steam extraction flow of instantaneous change strengthens the load response ability of unit, if 0 # increases the change and can't satisfy primary control's requirement, then through the change of unit flow gross order, compensate the not enough problem of 0 # increases primary control ability, specifically do:
fitting to obtain a function of the opening degree and the slip of the No. 0 high plus main damper under the working conditions of 520MW, 430MW, 360MW and 330MW through a relation curve of the opening degree and the slip of the No. 0 high plus main damper, and obtaining a function relation of the opening degree of the No. 0 high plus damper corresponding to the slip under the working conditions of 50% -80% THA through a fitting curve function and an interpolation method:
k1＝-0.0170×rc 5+0.2296×rc 4-1.3849×rc 3+3.6856×rc 2-10.0132×rc+70.7628
k2＝-0.2136×rc 5+3.5354×rc 4-23.1467×rc 3+74.2216×rc 2-121.5501×rc+144.6477
k3＝0.0576×rc 5-1.1286×rc 4+8.0592×rc 3-26.6014×rc 2+34.2508×rc+55.0269
in the formula: k is a radical of1-520MW operating mode No. 0 plus main regulating opening,%;
k2430MW working condition No. 0 high plus main regulating valve opening degree,%;
k3-360MW operating condition No. 0 plus main regulating valve opening,%;
rc-turbine slip (negative), r/min;
rc≤4.8。
when the load of the unit is more than 430MW and less than or equal to 520MW, the opening function relationship of the 0-degree high plus regulating valve is as follows:
k＝k1+(w-430)/2*(k1-k2)
when the load of the unit is more than 360MW and less than or equal to 430MW, the opening function relationship of the 0-number high plus regulating valve is as follows:
k＝k2+(w-360)/2*(k2-k3)
when the load of the unit is not less than 330MW and not more than 360MW, the opening function relationship of the No. 0 high plus regulating valve is as follows:
k＝k3
when the load of the unit is under the working condition of 330-520 MW and the primary frequency modulation is small in disturbance, the valve position instruction (shown in figure 6) corresponding to the 0 # high plus main regulating gate can be directly obtained by correspondingly calculating the slip limit number according to the functional relation, so that the response lag time of the primary frequency modulation is reduced, and the frequency modulation load meets the small disturbance requirement.
In order to meet the requirement that the slip of the primary frequency modulation small disturbance of the unit reduces the load rise change condition, a 0 # high-pressure-plus-regulating-gate disturbance test is carried out under the control mode of the 0 # high-pressure-plus-regulating-gate optimum control curve under the working conditions of 510MW, 430MW, 360MW and 330MW of the unit, the slip change range of the steam turbine is 2.2-4.8 r/min (negative direction), and the 0 # high-pressure-plus-regulating-gate is regulated when the slip changes by 0.2r/min, so that the load change and response of the unit meet the requirement of the primary frequency modulation small disturbance. In the test, the maximum variation range of the 0 # high plus main control valve opening is 20-25%, and the requirement of primary frequency modulation small disturbance is met.
As shown in FIG. 4, under the working condition of 50% -80% THA, the variation of the No. 0 high plus damper can meet the negative slip variation of the primary frequency modulation small disturbance, under the working conditions of 330MW and 360MW, the opening degree of the No. 0 high plus damper is basically the same as the slip curve, a function of the opening degree and the slip of the No. 0 high plus main governor of 520MW, 430MW and 360MW (330MW) can be obtained by fitting a relation curve of the opening degree and the slip of the No. 0 high plus main governor, and by fitting a curve function and an interpolation method, the functional relation of the rotation difference corresponding to the 0 # high plus regulating opening under the working condition of 50-80 percent THA can be obtained, when the load of the unit is under the working condition of 330-520 MW and the primary frequency modulation is small disturbance, the 0 # high plus main regulating gate can directly correspondingly calculate the valve position instruction corresponding to the 0 # high plus main regulating gate according to the above functional relation by the slip limit number, therefore, the delay time of the primary frequency modulation response can be less than 3s, and the frequency modulation load meets the requirement of small disturbance.
According to the invention, a section 0 of air suction pipeline is connected with the air inlet end of a section 0 of high-pressure heater, a drainage system pipeline is arranged between the air outlet end of the section 0 of high-pressure heater and the air inlet end of the section 1 of high-pressure heater, a steam discharge warm pipe communicated with the section 0 of air suction pipeline is connected on the section 0 of air suction pipeline, one end of the steam discharge warm pipe, far away from the section 0 of air suction pipeline, is connected with the air inlet of a deaerator, the water outlet of the section 1 of high-pressure heater is connected with the water inlet of the section 0 of high-pressure heater, the air inlet of the section 1 of high-pressure heater is connected with the air outlet of the section 1 of air cylinder, and.
The hardware part of the No. 0 Gaojia optimized control system of the invention is connected with a power plant system computer by adopting a PLC controller, and good technical effects are produced through actual operation: under the working condition that 50% -80% THA of the units 1 and 2 of a certain power plant is achieved, the high steam pressure of the No. 0 is controlled through the optimal control curve of the high steam pressure of the No. 0 of the system, and in a 330MW load area, the heat consumption is reduced by 50.2kJ/kWh compared with that of a traditional operation mode; in the 370MW load region, the heat consumption is 24kJ/kWh lower than that of the traditional operation mode; in the 440MW load region, the heat consumption is 58.8kJ/kWh lower than that of the traditional operation mode; in the 520MW load region, the heat consumption is 58.5kJ/kWh lower than that of the traditional operation mode. Calculated according to the annual generating capacity of the unit of about 30 hundred million kWh, about 4300t of standard coal is saved every year, and 258 ten thousand yuan per year of direct economic benefit can be generated. The unit can meet the requirement of primary frequency modulation small disturbance (less than 0.08Hz) under the working condition of 50-80% THA through No. 0 high plus regulation, the average number of times of primary frequency modulation small disturbance examination of the unit for 4-10 months is calculated for 24 times, 17 ten thousand yuan is scheduled and examined every month, and therefore the generated indirect benefit is estimated to be 204 ten thousand yuan, and the unit has good social and economic benefits.
Claims (4)
1. A0 # high heating optimization control system based on multi-data judgment is characterized by comprising 4 control levels which are respectively a heating pipe control level, an environment-friendly control level, an economic control level and a primary frequency modulation control level, the automatic operation of the 0 # high heating whole course after a unit is started and connected to the grid is realized through the 4 control levels, and the 0 # high heating control, the environment-friendly control, the economic control and the primary frequency modulation control optimization are realized according to heat control measurement values of 0 pumping pressure, 0 pumping temperature, 0 # high heating outlet temperature, 0 pumping pipeline upper and lower wall temperature, 0 # high heating steam inlet pressure, unit load and primary frequency modulation slip signals, so that the optimal economic performance of the 0 # high heating is achieved;
wherein:
the heating pipe control level: before the high pressure heater is put into operation at No. 0, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is slowly increased by controlling the opening degree of a main regulating valve of the 0-pumping pipeline, the temperature of the upper wall and the lower wall of the 0-pumping pipeline is less than 3 ℃/min to serve as the control speed of the heating pipe, when the temperature of the high pressure inlet steam at No. 0 is close to the temperature of the 0-pumping pipeline, the heating pipe is finished, and the heating pipe control mode of the high pressure heater at No.;
environmental protection control level: before the unit is connected to the grid, the high heater No. 0 is put in, and the water supply temperature of the unit is improved by the operation of the high heater No. 0, so that the smoke temperature at the outlet of the economizer is improved, the smoke temperature at the inlet of the SCR is improved, the operation condition of the SCR is met, the load range of the operation of a denitration system is expanded, and the environmental protection level of the unit is greatly improved;
and (3) economic control level: according to the unit load and the outlet temperature of the high pressure heater No. 0, the optimal operation high pressure control pressure No. 0 is set according to the optimal high pressure operation curve No. 0, so that the economic performance of the unit is improved to the maximum extent;
primary frequency modulation control level: through the change of the opening degree of the main throttle valve with the number 0 being increased, the 0 steam extraction pressure is instantaneously changed, the load response capacity of the unit is enhanced, and the primary frequency modulation capacity of the unit is improved.
2. The multiple data judgment-based # 0 hga optimization control system of claim 1, wherein the specific control method of the warm pipe control stage is as follows:
before the high-temperature operation of No. 0, slowly raising the temperature of the upper wall and the lower wall of the 0-pumping pipeline by controlling the opening degree of a valve of the 0-pumping pipeline bypass heating pipe system, and taking the temperature of the upper wall and the lower wall of the 0-pumping pipeline which is less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is less than 3 ℃, the opening degree of the bypass valve of the heating pipe is increased by 1%;
if the difference between the current value of the upper and lower wall temperatures of the pipeline 0 and the value 1min before the temperature of the upper and lower walls of the pipeline 0 is greater than 3 ℃, the opening degree of the bypass valve of the heating pipe is reduced by 1%;
when the temperature value of the upper wall and the lower wall of the pipeline is greater than 200 ℃ at 0, the bypass heating pipe is finished, and the bypass door adjusting instruction of the heating pipe is automatically set to 25%;
slowly opening a No. 0 high steam-feeding main regulating valve, and taking the temperature of the upper wall and the lower wall of a 0-pumping pipeline less than 3 ℃/min as the control speed of the heating pipe;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is less than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is increased by 1 percent;
if the difference between the current value of the upper and lower wall temperatures of the extraction pipeline 0 and the value 1min before the temperature of the upper and lower walls of the extraction pipeline 0 is greater than 3 ℃, the opening of the No. 0 high steam inlet main steam regulating valve is reduced by 1 percent;
when the deviation between the upper and lower wall temperature values of the 0 pumping pipeline and the 0 high steam inlet temperature value is +/-20 ℃, the upper and lower wall temperatures of the 0 high steam inlet pipeline are determined to be close to the steam inlet temperature, the main heating pipe is finished, and the heating pipe mode is automatically cut off.
3. The multiple data judgment-based # 0 high-voltage boost optimization control system according to claim 1, wherein the setting of the optimal operating # 0 high-voltage boost control pressure in the economic control level according to the optimal # 0 high-voltage boost operating curve specifically comprises: when the primary frequency modulation of the unit does not act, the unit No. 0 high-pressure valve position of the high-pressure main regulating valve is controlled according to a fitting curve formula corresponding to the optimal control curve of the steam pressure of the high-pressure inlet of the No. 0 unit, and the fitting curve formula is as follows:
f(p)＝-0.00000003*w3+0.00003068*w2-0.00271022*w+5.09695863
wherein: w is more than or equal to 330MW and less than or equal to 520 MW;
p is 0 # high inlet pressure; and w is the unit load.
4. The multiple data judgment-based # 0 hga optimization control system of claim 1, wherein the specific control method of the primary frequency modulation control stage is as follows:
under the little disturbance condition of unit primary control, through the aperture that changes the main governing door that 0 # increases earlier, 0 steam extraction flow of instantaneous change strengthens the load response ability of unit, if 0 # increases the change and can't satisfy primary control's requirement, then through the change of unit flow gross order, compensate the not enough problem of 0 # increases primary control ability, specifically do:
fitting to obtain a function of the opening degree and the slip of the No. 0 high plus main damper under the working conditions of 520MW, 430MW, 360MW and 330MW through a relation curve of the opening degree and the slip of the No. 0 high plus main damper, and obtaining a function relation of the opening degree of the No. 0 high plus damper corresponding to the slip under the working conditions of 50% -80% THA through a fitting curve function and an interpolation method:
k1＝-0.0170×rc 5+0.2296×rc 4-1.3849×rc 3+3.6856×rc 2-10.0132×rc+70.7628
k2＝-0.2136×rc 5+3.5354×rc 4-23.1467×rc 3+74.2216×rc 2-121.5501×rc+144.6477
k3＝0.0576×rc 5-1.1286×rc 4+8.0592×rc 3-26.6014×rc 2+34.2508×rc+55.0269
in the formula: k is a radical of1-520MW operating mode No. 0 plus main regulating opening,%;
k2430MW working condition No. 0 high plus main regulating valve opening degree,%;
k3-360MW operating condition No. 0 plus main regulating valve opening,%;
rc-turbine slip (negative), r/min;
rc≤4.8。
when the load of the unit is more than 430MW and less than or equal to 520MW, the opening function relationship of the 0-degree high plus regulating valve is as follows:
k＝k1+(w-430)/2*(k1-k2)
when the load of the unit is more than 360MW and less than or equal to 430MW, the opening function relationship of the 0-number high plus regulating valve is as follows:
k＝k2+(w-360)/2*(k2-k3)
when the load of the unit is not less than 330MW and not more than 360MW, the opening function relationship of the No. 0 high plus regulating valve is as follows:
k＝k3
when the load of the unit is under the working condition of 330-520 MW and the primary frequency modulation is small in disturbance, the 0 # high plus main regulating gate can directly correspondingly calculate the valve position instruction corresponding to the 0 # high plus main regulating gate through the slip limit number according to the above functional relation, so that the response lag time of the primary frequency modulation is reduced, and the frequency modulation load meets the small disturbance requirement.
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