CN108023360B - Thermoelectric peak shifting and heat supply network heat storage based power grid peak regulation participating thermal power plant and peak regulation method - Google Patents
Thermoelectric peak shifting and heat supply network heat storage based power grid peak regulation participating thermal power plant and peak regulation method Download PDFInfo
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- CN108023360B CN108023360B CN201711451153.8A CN201711451153A CN108023360B CN 108023360 B CN108023360 B CN 108023360B CN 201711451153 A CN201711451153 A CN 201711451153A CN 108023360 B CN108023360 B CN 108023360B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The invention discloses a thermoelectric power plant participating in power grid peak regulation based on thermoelectric peak shifting and heat supply network heat storage. The thermal power plant consists of an overheated steam boiler, a back-extraction steam turbine, a generator, a steam-driven water feeding pump, a deaerator, a first/second high-pressure heater, a shaft seal/water replenishing heater, a medium/low-pressure heat supply main pipe, a medium/low-pressure steam temperature reducing device and a thermal power plant monitoring peak regulation center. On the basis of meeting the thermal load, the thermal power plant utilizes the limited peak regulation capacity of the mechanical furnace and participates in the power grid peak regulation based on the thermoelectric peak shifting; by means of the heat storage characteristic of the heat supply network, the thermoelectric coupling relation is pulled apart, and further peak regulation of the power grid is implemented. The mode of 'fixing power with heat' is changed into a thermoelectric coordination mode, and the peak regulation of the power grid is participated on the basis of thermoelectric peak shifting and heat storage characteristics of the heat supply network; the method is favorable for relieving the shortage of peak shaving capacity of the provincial dispatching power grid. The method is based on the thermoelectric peak shifting and heat supply network heat storage, participates in the power grid peak regulation thermal power plant, and is based on the existing equipment and follows the existing flow; and secondary equipment investment and secondary personnel training are not required.
Description
Technical Field
The invention belongs to the technical field of cogeneration; in particular to a thermal power plant and a peak regulation method which are oriented to industrial heat users in an industrial gathering area and participate in power grid peak regulation based on peak load staggering of thermoelectricity and heat storage of a heat supply network.
Background
The resources of 'rich coal, poor oil and little gas' in China are inherited, and the power generation mode mainly based on coal is certainly maintained within a foreseeable time. The sustainable development of energy production and consumption depends on the development of renewable low-carbon energy at the supply side; efficient and low-pollution technologies on the demand side are also expected. Under the condition of the prior art, the energy efficiency of a boiler, a steam turbine and a generator is more than or equal to 94.8 percent, 90 percent and 99 percent; the comprehensive energy efficiency is more than or equal to 84.4 percent. The actual comprehensive energy efficiency is less than or equal to 45 percent due to the cold source loss of the traditional thermal power.
In addition, most thermal power plants need to supply heat to users in the form of medium/low pressure steam through pipelines of more than ten kilometers, and the thermal parameters of the steam are allowed to fluctuate within a certain range; the peak regulation of the power grid is implemented by utilizing the thermal inertia and the thermal hysteresis of the heat supply network and by means of the heat storage characteristic of the heat supply network. The summary of the representative intellectual property achievements of the thermal power plant participating in the power grid peak shaving is as follows:
the invention relates to an electric peak shaving heat-electricity-cold combined supply operation method and a device thereof (ZL00134616.4), which provides a heat accumulator for balancing the supply and demand difference between heating and cooling loads caused by the participation of a cogeneration unit in electric peak shaving operation; the operation mode of 'heating for fixing the electricity' is changed into the operation of electric power peak regulation.
The invention discloses a combined heat and power type compressed air energy storage system and a method for a back-pressure thermoelectric unit (ZL201510066753.7), and provides an energy storage system combining cogeneration and heat insulation compressed air, wherein a compressed air energy storage device compresses and stores redundant electric energy in the valley of power utilization, and the compressed air expands to generate power in the peak of power utilization.
The invention relates to a method for realizing the participation of a thermoelectric unit in system peak regulation scheduling by utilizing heat supply time lag (application number 201511024034.5), and provides a method for solving the problem of power grid peak regulation caused by the fact that the thermoelectric unit does not participate in peak regulation or participate in small peak regulation capacity on the premise of not influencing the living needs by utilizing the heat supply time lag.
The invention relates to a thermoelectric decoupling peak-shaving system (application number 201710481055.2), and provides a method for converting electric energy into heat energy to be sent to a heating power pipe network by starting an electric boiler and a circulating water heat pump so as to absorb the electric quantity of abandoned wind, abandoned light and peak shaving; the thermal power plant can be completely thermally and electrically decoupled, so that the pure condensation operation deep peak regulation of the thermal power plant becomes possible.
The intellectual property achievement has reference value; however, the method has limitations due to the shortage of power grid peak shaving exploration according to the characteristics of thermal power plants in east regions of Zhejiang and the like; therefore, further innovative designs are necessary.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a thermoelectric power plant and a method for participating in power grid peak shaving based on thermoelectric peak shifting and heat supply network heat storage.
The peak-shaving thermal power plant participating in power grid based on thermoelectric peak shifting and heat supply network heat storage is characterized in that the thermal power plant consists of an overheated steam boiler, a back-suction steam turbine, a generator, a steam-driven water feeding pump, a deaerator, a first high-pressure heater, a second high-pressure heater, a shaft seal heater, a water supplementing heater, a medium-pressure heat supply main pipe, a low-pressure heat supply main pipe, a medium-pressure steam temperature reducing device, a low-pressure steam temperature reducing device, a thermal power plant steam pipeline, a thermal power plant water feeding pipeline and a thermal power plant monitoring peak-shaving center, wherein the model of the overheated steam boiler is NG-500/10.1-M, the model of the back-suction steam turbine is EHNG71/63/160, the model of the generator is 50WX18Z-054 LLT; the steam pipelines of the thermal power plant comprise pipelines from a boiler to a steam turbine, pipelines from a first-stage steam extraction device to a medium-pressure steam temperature reduction device, pipelines from the medium-pressure steam temperature reduction device to a medium-pressure heat supply main pipe, pipelines from a second-stage steam extraction device to a first high-pressure heater, pipelines from a third-stage steam extraction device to a second high-pressure heater, pipelines from the steam turbine to a steam-driven water supply pump, pipelines from the low-pressure steam temperature reduction device to a low-pressure heat supply main pipe, pipelines from the steam-driven water supply pump to a water supplement heater, pipelines from a shaft seal air leakage to the shaft seal heater, and pipelines; the water supply pipeline of the thermal power plant comprises a pipeline from a chemical desalting water tank to a shaft seal heater, a pipeline from the shaft seal heater to a water supplement heater, a pipeline from the water supplement heater to a deaerator, a pipeline from the deaerator to a steam-driven water supply pump, a pipeline from the steam-driven water supply pump to a second high-pressure heater, a pipeline from the second high-pressure heater to a first high-pressure heater, a pipeline from the first high-pressure heater to an overheated steam boiler, a drain pipeline from the first high-pressure heater to the second high-pressure heater, a drain pipeline from the second high-pressure heater to the deaerator, a drain pipeline from the shaft seal heater to the;
the superheated steam boiler drives a generator to generate electricity through a back-extraction steam turbine, and the electricity generated by the generator is connected to a power grid; the back-drawing steam turbine is connected with the steam-driven water-feeding pump, the shaft seal heater is connected with the superheated steam boiler through a water-supplementing heater, a deaerator, the steam-driven water-feeding pump, a second high-pressure heater and a first high-pressure heater, the medium-pressure heat supply main pipe is connected with the medium-pressure steam temperature reducing device, and the low-pressure heat supply main pipe is connected with the low-pressure steam temperature reducing device; exhaust of the back-extraction steam turbine is divided into two parts, and one path of low-grade heat energy steam drives the steam-driven water-feeding pump to do work to provide power for a water-feeding system of the superheated steam boiler; the back-extraction type steam turbine is provided with three-stage extraction steam, the first-stage extraction steam adjusts steam parameters through the medium-pressure steam temperature-reducing device, medium-pressure steam thermal parameters output by the medium-pressure steam temperature-reducing device reach the standard and supply heat to medium-pressure steam industrial users through a medium-pressure heat supply main pipe, the second-stage extraction steam and the third-stage extraction steam heat supply water to the superheated steam boiler, the other path of back-extraction type steam turbine exhaust steam adjusts steam parameters through the low-pressure steam temperature-reducing device, low-pressure steam thermal parameters output by the low-pressure steam temperature-reducing device reach the standard, and supply heat to low-pressure steam industrial users through the low-pressure heat supply main pipe; the pressure of the medium-pressure heat supply main pipe is 2.6-3.0Mpa, the temperature is 280-plus-300 ℃, the pressure of the low-pressure heat supply main pipe is 0.68-0.84Mpa, and the temperature is 250-plus-280 ℃; the thermal and electrical parameters of the thermal power plant and the state of an actuator are connected to a thermal power plant monitoring and peak-shaving center through a sensor, a transmitter and a controller, and the thermal power plant monitoring and peak-shaving center is connected with a general-control center of a provincial power grid; the method comprises the following steps that on the basis that thermal load is met, a thermal power plant implements power grid peak regulation based on thermoelectric peak shifting; by means of the heat storage characteristic of the heat supply network, further peak regulation of the power network is implemented.
The method for participating in power grid peak regulation based on thermoelectric peak shifting of the thermal power plant is characterized in that peak shifting exists between the electric load of a power grid and the thermal load of the thermal power plant, and the thermal power plant participates in power grid peak regulation based on thermoelectric peak shifting by utilizing the limited peak regulation capacity of a machine furnace on the basis of meeting the thermal load; electrical load of the grid: the time interval of 8-22 points is peak load, and the rest time intervals are valley load; thermal load of thermal power plant: the time periods of 5-7 points and 17-20 points are valley loads, the time periods of 2-5 points and 12-17 points are median loads, and the rest time periods are peak loads; the thermal output of the thermal power plant meets the thermal load of the thermal power plant, and the thermal power plant participates in power grid peak regulation based on thermal power offset: valley heat output and valley electricity output at the time interval of 5-7 points; at the time period of 7-8 points, the peak thermal output and the median electrical output are obtained; at the time interval of 8-12 points, peak thermal output and peak electrical output; at the time period of 12-17 points, the median thermal output and the peak electrical output; at 17-20 points, valley heat output and median electricity output; at the time period of 20-22 points, peak thermal output and peak electrical output; at 22-2 points, peak thermal output and median electrical output; at the time interval of 2-5 points, the median heat output and the valley power output are carried out; the thermal power plant which fixes power by heat is transformed into the thermal power plant which participates in peak regulation of the power grid based on thermoelectric peak shifting, namely, the thermal power plant carries out bidirectional peak regulation on peak-valley load of the power grid on the basis of meeting thermal load.
The method for participating in power grid peak shaving based on thermoelectric peak staggering and heat supply network heat storage is characterized in that on the basis of participating in power grid peak shaving, a thermoelectric load coupling relation is pulled by means of heat supply network heat storage characteristics, further peak shaving of a power grid is implemented, the peak shaving time period is 20-5 points, valley peak shaving of electric output is carried out by overlapping, and the flow of the peak shaving of the electric output when the power grid is in valley load is specifically as follows:
(1) in the 20-22 point period, the temperature set value is increased from T _ middle _ lower to T _ middle _ upper heat supply network heat accumulation and heat increment quantity Q _ MLtoMU, and the peak heat output and the peak electricity output are obtained at the moment;
(2) at the time period of 22-2 points, the temperature given value is reduced from T _ middle _ upper to T _ middle, the Q _ MUtom is reduced for heat storage of the heat supply network, the heat output is smaller than the peak heat output, the electric output is smaller than the median electric output, and the valley value of the power supply network is reduced
(3) In the period of 2-5 points, the temperature given value is reduced from T _ middle to T _ middle _ lower, the heat storage of the heat supply network is reduced by Q _ MtoML, at the moment, the heat output is less than the median heat output, the electricity output is less than the valley electricity output, and the valley of the power supply network is reduced;
wherein the variables are specified as follows:
temperature, T heat quality of heat, Q
Specific heat capacity, Mass C Mass, M
Upper limit of temperature T _ upper
Lower temperature limit T _ lower
Temperature median T _ middle × (T _ upper + T _ lower) 0.5 ×
Upper value in temperature T _ middle _ upper ═ 0.5 × (T _ middle + T _ upper)
Lower value in temperature T _ middle _ lower ═ 0.5 × (T _ middle + T _ lower)
Heat supply network heat accumulation, H
Heat storage HT _ middle ═ C × M × (T _ middle-T _ lower) at median temperature
Heat storage HT _ middle _ upper of heat supply network at upper value of temperature
＝C×M×(T_middle_upper－T_lower)
Heat storage HT _ middle _ lower of heat supply network at lower value of temperature
＝C×M×(T_middle_lower－T_lower)
Up-to-middle heat storage amount in temperature Q _ MUtoM ═ HT _ middle-HT _ middle _ upper
The heat storage amount Q _ MtoML _ lower-HT _ middle at the middle to middle temperature
Heat storage amount Q _ MLtoMU at middle to middle and upper temperatures
＝HT_middle_upper－HT_middle_lower
Q_MLtoMU＞0、Q_MUtoM＜0、Q_MtoML＜0
The algorithm is illustrated as follows:
1. the lower temperature limit T _ lower takes the heat storage of the heat supply network as the reference
2. Value ranges T _ middle _ upper, T _ middle _ lower for temperature setpoint
The heat stored in the heat supply network is adjusted by changing the given temperature value
3. Temperature set value is restricted by heat supply safety
Peak thermal load or peak to be entered, temperature setpoint T _ middle _ upper
Heat load valley or going to valley, temperature setpoint T _ middle _ lower
Median thermal load or going to median, temperature setpoint T _ middle
Compared with the prior art, the invention has the following beneficial effects:
the thermal power plant meets the thermal load; by taking the success case of the nuclear power participating in the peak regulation of the power grid in the time period, the limited peak regulation capability of the mechanical furnace is utilized, and the bidirectional peak regulation of the peak-valley load of the power grid is participated on the basis of the peak staggering of the thermoelectricity. By means of the heat storage characteristic of the heat supply network, the coupling relation of thermoelectric loads is pulled, and further peak regulation of the power grid is implemented. The operation mode of the thermal power plant 'fixing power with heat' is changed into a thermoelectric coordination operation mode, which participates in power grid peak regulation based on thermoelectric peak shifting and heat storage characteristics of a heat supply network, and is beneficial to relieving shortage of peak regulation capacity of a provincial power grid. The method is based on the thermoelectric peak shifting and heat supply network heat storage, participates in the power grid peak regulation thermal power plant, and is based on the existing equipment and follows the existing flow; and secondary equipment investment and secondary personnel training are not required.
Drawings
FIG. 1 is a schematic block diagram of a thermal power plant participating in peak shaving of a power grid based on thermal power staggering and thermal power grid heat storage;
FIG. 2 is a graph of electrical load of the X grid and thermal load of the thermal power plant;
FIG. 3 is an electrical load line graph of the X grid;
FIG. 4 is a line graph of the thermal load of a thermal power plant;
FIG. 5 is a line graph of the thermal output of the thermal power plant;
FIG. 6 is a line graph of power plant power output based on thermal power staggering peaks;
FIG. 7 is a line graph of thermal power plant thermal output with thermal grid storage;
FIG. 8 is a conventional thermoelectric power plant electrical heating signature diagram;
FIG. 9 is a diagram of the thermoelectric power plant's electrical heating signature with heat stored by the thermal network.
The three-digit 1/2/3X X number is adopted in the figure, 1/2/3 represents equipment/steam/water, XX is a serial number
The dashed line, the solid line and the double-dashed thick line are adopted in the figure to represent the steam pipeline, the water pipeline and the power line of the equipment
101-superheated steam boiler, 102-back pressure turbine, 103-generator, 104-steam feed pump,
105-deaerator, 106-first high-pressure heater, 107-second high-pressure heater, 108-shaft seal heater,
109-a water replenishing heater, 111-a medium-pressure heat supply main pipe, 112-a low-pressure heat supply main pipe,
121-medium pressure steam attemperator, 122-low pressure steam attemperator;
200-boiler to turbine pipeline, 201-primary extraction to medium pressure steam temperature reduction device pipeline,
202-medium pressure steam attemperation to medium pressure heat supply main pipe line,
203-secondary steam extraction to a first high-pressure heater pipeline, 204-tertiary steam extraction to a second high-pressure heater pipeline,
205-steam turbine to steam feed pump pipeline, 206-low pressure steam temperature reduction device to low pressure heat supply main pipe pipeline,
207-steam feed water pump to make-up water heater line,
208-shaft seal air leakage to a shaft seal heater pipeline, 209-steam turbine to a low-pressure steam temperature reduction device pipeline;
300-chemical desalting water tank to shaft seal heater pipeline, 301-shaft seal heater to water replenishing heater pipeline,
302-make-up water heater to deaerator line, 304-deaerator to steam feed water pump line,
305-steam feed pump to No. two high pressure heater lines,
306-high pressure heater No. two to high pressure heater No. one line,
307-high pressure heater to superheated steam boiler line,
308-a high pressure heater from the first to the second,
309-second high pressure heater to deaerator drain line,
321-shaft sealing the heater to a water charging heater drain pipeline, 303-water charging heater to a deaerator drain pipeline;
Detailed Description
As shown in fig. 1, the power grid peak shaving thermal power plant based on thermoelectric peak shifting and heat supply network heat storage is composed of an overheated steam boiler 101, a back extraction type steam turbine 102, a generator 103, a steam-driven water feed pump 104, a deaerator 105, a first high pressure heater 106, a second high pressure heater 107, a shaft seal heater 108, a water replenishing heater 109, a medium pressure heat supply main pipe 111, a low pressure heat supply main pipe 112, a medium pressure steam temperature reducing device 121, a low pressure steam temperature reducing device 122, a thermal power plant steam pipeline, a thermal power plant water feed pipeline and a thermal power plant peak shaving monitoring center, wherein the model number of the overheated steam boiler 101 is NG-500/10.1-M, the model number of the back extraction type steam turbine 102 is EHNG71/63/160, the model number of the generator 103 is 50WX18Z-054LLT and the power is 50; the steam pipelines of the thermal power plant comprise a boiler-to-steam turbine pipeline 200, a first-stage steam extraction-to-medium pressure steam temperature reduction device pipeline 201, a medium pressure steam temperature reduction device-to-medium pressure heat supply main pipe pipeline 202, a second-stage steam extraction-to-first high pressure heater pipeline 203, a third-stage steam extraction-to-second high pressure heater pipeline 204, a steam turbine-to-steam water supply pump pipeline 205, a low pressure steam temperature reduction device-to-low pressure heat supply main pipe pipeline 206, a steam turbine water supply pump-to-water supply heater pipeline 207, a shaft seal air leakage-to-shaft seal heater pipeline 208 and a steam turbine-to-low pressure steam temperature reduction device pipeline 209; the water supply pipeline of the thermal power plant comprises a chemical desalting water tank-to-shaft seal heater pipeline 300, a shaft seal heater-to-water supplement heater pipeline 301, a water supplement heater-to-deaerator pipeline 302, a deaerator-to-steam feed water pump pipeline 304, a steam feed water pump-to-second high-pressure heater pipeline 305, a second high-pressure heater-to-first high-pressure heater pipeline 306, a first high-pressure heater-to-superheated steam boiler pipeline 307, a first high-pressure heater-to-second high-pressure heater drain pipeline 308, a second high-pressure heater-to-deaerator drain pipeline 309, a shaft seal heater-to-water supplement heater drain pipeline 321 and a water supplement heater-to-deaerator drain pipeline;
the superheated steam boiler 101 drives a generator 103 to generate electricity through a back-extraction steam turbine 102, and the electricity generated by the generator 103 is connected to a power grid; the back-drawing type steam turbine 102 is connected with a steam-driven water-feeding pump 104, a shaft seal heater 108 is connected with a superheated steam boiler 101 through a water supplementing heater 109, a deaerator 105, the steam-driven water-feeding pump 104, a second high-pressure heater 107 and a first high-pressure heater 106, a medium-pressure heat supply main pipe 111 is connected with a medium-pressure steam temperature reducing device 121, and a low-pressure heat supply main pipe 112 is connected with a low-pressure steam temperature reducing device 122; the exhaust of the back-extraction steam turbine 102 is divided into two parts, and one path of low-grade heat steam drives the steam-driven water-feeding pump 104 to work and provide power for the water-feeding system of the superheated steam boiler 101; the back-extraction steam turbine 102 is provided with three stages of extraction steam, the first stage of extraction steam adjusts steam parameters through the medium-pressure steam temperature-reducing device 121, so that the medium-pressure steam thermal parameters output by the medium-pressure steam temperature-reducing device 121 reach the standard, and supplies heat for medium-pressure steam industrial users through the medium-pressure heat supply main pipe 111, the second stage of extraction steam and the third stage of extraction steam heat the superheated steam boiler 101 to supply water, the other path of exhaust of the back-extraction steam turbine 102 adjusts steam parameters through the low-pressure steam temperature-reducing device 122, so that the low-pressure steam thermal parameters output by the low-pressure steam temperature-reducing device 122 reach the standard, and supplies heat for low-pressure steam industrial users through the low-; the pressure of the medium-pressure heat supply main pipe is 2.6-3.0Mpa, the temperature is 280-plus-300 ℃, the pressure of the low-pressure heat supply main pipe is 0.68-0.84Mpa, and the temperature is 250-plus-280 ℃; the thermal and electrical parameters of the thermal power plant and the state of an actuator are connected to a thermal power plant monitoring and peak-shaving center through a sensor, a transmitter and a controller, and the thermal power plant monitoring and peak-shaving center is connected with a general-control center of a provincial power grid; the method comprises the following steps that on the basis that thermal load is met, a thermal power plant implements power grid peak regulation based on thermoelectric peak shifting; by means of the heat storage characteristic of the heat supply network, further peak regulation of the power network is implemented.
Description 1: in view of the mature thermal and electrical parameter detection and control technology of the thermal power plant, the superheated steam boiler, the extraction-back steam turbine and the generator belong to the known knowledge range; only reference to not expanding herein. The structure of a thermal power plant of a cogeneration system is described with a view to completeness of the contents; and electricity, heat, water, steam related energy flows, streams.
As shown in fig. 2-6, peak shifting exists between the electrical load of the X power grid and the thermal load of the thermal power plant, and the thermal power plant participates in power grid peak regulation based on the peak shifting of the thermal power plant by using the limited peak regulation capability of the boiler on the basis of satisfying the thermal load; electrical load of the X grid: the time interval of 8-22 points is peak load, and the rest time intervals are valley load; thermal load of thermal power plant: the time periods of 5-7 points and 17-20 points are valley loads, the time periods of 2-5 points and 12-17 points are median loads, and the rest time periods are peak loads; the thermal output of the thermal power plant meets the thermal load of the thermal power plant, and the thermal power plant participates in power grid peak regulation based on thermal power offset: valley heat output and valley electricity output at the time interval of 5-7 points; at the time period of 7-8 points, the peak thermal output and the median electrical output are obtained; at the time interval of 8-12 points, peak thermal output and peak electrical output; at the time period of 12-17 points, the median thermal output and the peak electrical output; at 17-20 points, valley heat output and median electricity output; at the time period of 20-22 points, peak thermal output and peak electrical output; at 22-2 points, peak thermal output and median electrical output; at the time interval of 2-5 points, the median heat output and the valley power output are carried out; the thermal power plant which fixes power by heat is transformed into the thermal power plant which participates in peak regulation of the power grid based on thermoelectric peak shifting, namely, the thermal power plant carries out bidirectional peak regulation on peak-valley load of the power grid on the basis of meeting thermal load.
The thermal power plant taking the superheated steam boiler, the extraction-back steam turbine and the generator as the core is a large-purity lag and large-time constant object and essentially has no real-time dynamic tracking capability of thermoelectric load; meanwhile, the service life of the equipment can be shortened by frequently adjusting the output of the equipment; thirdly, the inherent thermoelectric coupling results in relatively limited peak shaving capability of the thermal power plant furnaces, and cannot achieve both peak/valley electrical output and valley/peak thermal output. Therefore, under the constraint condition of the up-down climbing rate of the output of the cogeneration unit, the thermal power plant participates in the semi-quantitative time interval peak shaving of the power grid based on the thermoelectric peak shifting by referring to the successful case of the nuclear power participating in the semi-quantitative time interval peak shaving of the power grid. Without loss of generality, the electrical load of the X power grid adopts an idealized broken line form to approximately describe peak-valley electrical load; the heat load of the thermal power plant refers to the heat supply data of a certain printing and dyeing industry gathering area in the province X, and the heat load is also described in an idealized broken line form.
As shown in fig. 7-9, the thermal power plant participates in the power grid peak shaving based on the thermal power offset and the heat storage of the heat supply network: based on the fact that thermoelectric peak shifting participates in peak shaving of the power grid, the thermoelectric load coupling relation is pulled by means of the heat storage characteristic of the heat supply network, and further peak shaving of the power grid is implemented; and considering the simplicity of expression and the importance of power grid valley peak shaving, selecting 20-5 points based on the time period when the heat storage of the heat supply network participates in the power grid peak shaving. By superposing the valley peak shaving of the electric output, the electric output peak shaving flow during the load of the valley of the power grid is as follows:
(1) in the 20-22 point period, the temperature set value is increased from T _ middle _ lower to T _ middle _ upper, the heat supply network stores heat and heat increment quantity Q _ MLtoMU, and the heat and heat increment quantity is peak heat output and peak electric output;
(2) at the time period of 22-2 points, the temperature given value is reduced from T _ middle _ upper to T _ middle, Q _ MUtom is reduced when the heat storage of the heat supply network is carried out, the heat output is smaller than the peak heat output, the electric output is smaller than the median electric output, and the valley value of the power supply network is reduced;
(3) in the period of 2-5 points, the temperature given value is reduced from T _ middle to T _ middle _ lower, the heat storage of the heat supply network is reduced by Q _ MtoML, at the moment, the heat output is less than the median heat output, the electricity output is less than the valley electricity output, and the valley of the power supply network is reduced;
the coupling relation of thermoelectric loads is pulled up by means of the heat storage characteristics of the heat supply network, and the electric heating characteristic diagram of the thermoelectric unit integrally deviates to the right; for a certain heat supply level h, if the adjustable ranges [ Pe, Pf ] of the heat storage and peak shaving of the heat supply network and the electric output are not utilized, the adjustable ranges [ Ph, Pm ] of the heat storage and peak shaving of the heat supply network and the electric output are extended.
Wherein the variables are specified as follows:
temperature, T heat quality of heat, Q
Specific heat capacity, Mass C Mass, M
Upper limit of temperature T _ upper
Lower temperature limit T _ lower
Temperature median T _ middle × (T _ upper + T _ lower) 0.5 ×
Upper value in temperature T _ middle _ upper ═ 0.5 × (T _ middle + T _ upper)
Lower value in temperature T _ middle _ lower ═ 0.5 × (T _ middle + T _ lower)
Heat supply network heat accumulation, H
Heat storage HT _ middle ═ C × M × (T _ middle-T _ lower) at median temperature
Heat storage HT _ middle _ upper of heat supply network at upper value of temperature
＝C×M×(T_middle_upper－T_lower)
Heat storage HT _ middle _ lower of heat supply network at lower value of temperature
＝C×M×(T_middle_lower－T_lower)
Up-to-middle heat storage amount in temperature Q _ MUtoM ═ HT _ middle-HT _ middle _ upper
The heat storage amount Q _ MtoML _ lower-HT _ middle at the middle to middle temperature
Heat storage amount Q _ MLtoMU at middle to middle and upper temperatures
＝HT_middle_upper－HT_middle_lower
Q_MLtoMU＞0、Q_MUtoM＜0、Q_MtoML＜0
The algorithm is illustrated as follows:
1. the heat storage of the heat supply network with the lower temperature limit T _ lower is taken as the reference
2. Value ranges T _ middle _ upper, T _ middle _ lower for temperature setpoint
The heat stored in the heat supply network is adjusted by changing the given temperature value
3. Temperature set value is restricted by heat supply safety
Peak thermal load or peak to be entered, temperature setpoint T _ middle _ upper
Heat load valley or going to valley, temperature setpoint T _ middle _ lower
The heat load median value or the median value to be entered, the temperature setpoint T _ middle.
Claims (1)
1. A method for participating in power grid peak regulation based on thermoelectric peak shifting by using a thermal power plant is characterized in that the thermal power plant comprises an overheated steam boiler (101), a back-extraction steam turbine (102), a generator (103), a steam-driven feed water pump (104), a deaerator (105), a first high-pressure heater (106), a second high-pressure heater (107), a shaft seal heater (108) and a water supplementing heater (109), the system comprises a medium-pressure heat supply main pipe (111), a low-pressure heat supply main pipe (112), a medium-pressure steam temperature reducing device (121), a low-pressure steam temperature reducing device (122), a steam pipeline of a thermal power plant, a water supply pipeline of the thermal power plant and a monitoring and peak-shaving center of the thermal power plant, wherein the model of an overheated steam boiler (101) is NG-500/10.1-M, the model of a back extraction type steam turbine (102) is EHNG71/63/160, the model of a generator (103) is 50WX18Z-054LLT, and the power is 50 MW; the steam pipeline of the thermal power plant comprises a boiler-to-steam turbine pipeline (200), a first-stage steam extraction-to-medium pressure steam temperature reduction device pipeline (201), a medium pressure steam temperature reduction device-to-medium pressure heat supply main pipeline (202), a second-stage steam extraction-to-first high pressure heater pipeline (203), a third-stage steam extraction-to-second high pressure heater pipeline (204), a steam turbine-to-steam water supply pump pipeline (205), a low pressure steam temperature reduction device-to-low pressure heat supply main pipeline (206), a steam water supply pump-to-water supply heater pipeline (207), a shaft seal air leakage-to-shaft seal heater pipeline (208) and a steam turbine-to-low pressure steam temperature reduction device pipeline (209); the water supply pipeline of the thermal power plant comprises a chemical desalting water tank-to-shaft seal heater pipeline (300), a shaft seal heater-to-water supplement heater pipeline (301), a water supplement heater-to-deaerator pipeline (302), a deaerator-to-steam feed pump pipeline (304), a steam feed pump-to-second high pressure heater pipeline (305), a second high pressure heater-to-first high pressure heater pipeline (306), a first high pressure heater-to-superheated steam boiler pipeline (307), a first high pressure heater-to-second high pressure heater drain pipeline (308), a second high pressure heater-to-deaerator drain pipeline (309), a shaft seal heater-to-water supplement heater drain pipeline (321) and a water supplement heater-to-deaerator drain pipeline (303);
the superheated steam boiler (101) drives a generator (103) to generate electricity through a back-extraction steam turbine (102), and the electricity generated by the generator (103) is connected to a power grid; the back-extraction type steam turbine (102) is connected with a steam-driven water-feeding pump (104), a shaft seal heater (108) is connected with an overheated steam boiler (101) through a water supplementing heater (109), a deaerator (105), the steam-driven water-feeding pump (104), a second high-pressure heater (107) and a first high-pressure heater (106), a medium-pressure heat supply main pipe (111) is connected with a medium-pressure steam temperature reducing device (121), and a low-pressure heat supply main pipe (112) is connected with a low-pressure steam temperature reducing device (122); exhaust of the back-extraction steam turbine (102) is divided into two parts, and one path of low-grade heat energy steam drives a steam feed water pump (104) to do work to provide power for a water supply system of the superheated steam boiler (101); the back-extraction type steam turbine (102) is provided with three stages of extraction steam, the first stage of extraction steam adjusts steam parameters through the medium-pressure steam temperature-reducing device (121), so that the medium-pressure steam thermal parameters output by the medium-pressure steam temperature-reducing device (121) reach the standard, and supplies heat for medium-pressure steam industrial users through the medium-pressure heat supply main pipe (111), the second stage of extraction steam and the third stage of extraction steam heat the superheated steam boiler (101) to supply water, the other path of exhaust gas of the back-extraction type steam turbine (102) adjusts steam parameters through the low-pressure steam temperature-reducing device (122), so that the low-pressure steam thermal parameters output by the low-pressure steam temperature-reducing device (122) reach the standard, and supplies heat for the low-pressure steam industrial users through the low-pressure heat; the pressure of the medium-pressure heat supply main pipe is 2.6-3.0Mpa, the temperature is 280-plus-300 ℃, the pressure of the low-pressure heat supply main pipe is 0.68-0.84Mpa, and the temperature is 250-plus-280 ℃; the thermal and electrical parameters of the thermal power plant and the state of an actuator are connected to a thermal power plant monitoring and peak-shaving center through a sensor, a transmitter and a controller, and the thermal power plant monitoring and peak-shaving center is connected with a general-control center of a provincial power grid; the method comprises the following steps that on the basis that thermal load is met, a thermal power plant implements power grid peak regulation based on thermoelectric peak shifting; further peak regulation of the power grid is implemented by means of the heat storage characteristic of the heat supply network;
the peak shifting exists between the electric load of the power grid and the heat load of the thermal power plant, and the thermal power plant utilizes the limited peak regulation capacity of the mechanical furnace to participate in the peak regulation of the power grid based on the peak shifting of the heat power; electrical load of the grid: the time interval of 8-22 points is peak load, and the rest time intervals are valley load; thermal load of thermal power plant: the time periods of 5-7 points and 17-20 points are valley loads, the time periods of 2-5 points and 12-17 points are median loads, and the rest time periods are peak loads; the thermal output of the thermal power plant meets the thermal load of the thermal power plant, and the thermal power plant participates in power grid peak regulation based on thermal power offset: valley heat output and valley electricity output at the time interval of 5-7 points; at the time period of 7-8 points, the peak thermal output and the median electrical output are obtained; at the time interval of 8-12 points, peak thermal output and peak electrical output; at the time period of 12-17 points, the median thermal output and the peak electrical output; at 17-20 points, valley heat output and median electricity output; at the time period of 20-22 points, peak thermal output and peak electrical output; at 22-2 points, peak thermal output and median electrical output; at the time interval of 2-5 points, the median heat output and the valley power output are carried out; the thermal power plant which fixes electricity by heat changes into a thermal power plant which participates in peak regulation of a power grid on the basis of thermoelectric peak shifting, namely, the thermal power plant carries out bidirectional peak regulation on peak-valley load of the power grid on the basis of meeting thermal load;
on the basis that thermoelectric peak shifting participates in peak shaving of the power grid, the thermoelectric load coupling relation is pulled up by means of the heat storage characteristic of the heat supply network, and further peak shaving of the power grid is implemented; the peak regulation time period is 20-5 points, and the peak regulation flow of the electric output during the load of the electric network valley value is as follows by overlapping the peak regulation of the electric output valley value:
(1) in the 20-22 point period, the temperature set value is increased from T _ middle _ lower to T _ middle _ upper, the heat supply network stores heat and heat increment quantity Q _ MLtoMU, and the heat and heat increment quantity is peak heat output and peak electric output;
(2) at the time period of 22-2 points, the temperature given value is reduced from T _ middle _ upper to T _ middle, Q _ MUtom is reduced when the heat storage of the heat supply network is carried out, the heat output is smaller than the peak heat output, the electric output is smaller than the median electric output, and the valley value of the power supply network is reduced;
(3) in the period of 2-5 points, the temperature given value is reduced from T _ middle to T _ middle _ lower, the heat storage of the heat supply network is reduced by Q _ MtoML, at the moment, the heat output is less than the median heat output, the electricity output is less than the valley electricity output, and the valley of the power supply network is reduced;
wherein the variables are specified as follows:
temperature, T heat quality of heat, Q
Specific heat capacity, Mass C Mass, M
Upper limit of temperature T _ upper
Lower temperature limit T _ lower
Temperature median T _ middle × (T _ upper + T _ lower) 0.5 ×
Upper value in temperature T _ middle _ upper ═ 0.5 × (T _ middle + T _ upper)
Lower value in temperature T _ middle _ lower ═ 0.5 × (T _ middle + T _ lower)
Heat supply network heat accumulation, H
Heat storage HT _ middle ═ C × M × (T _ middle-T _ lower) at median temperature
Heat storage HT _ middle _ upper of heat supply network at upper value of temperature
＝C×M×(T_middle_upper－T_lower)
Heat storage HT _ middle _ lower of heat supply network at lower value of temperature
＝C×M×(T_middle_lower－T_lower)
Up-to-middle heat storage amount in temperature Q _ MUtoM ═ HT _ middle-HT _ middle _ upper
The heat storage amount Q _ MtoML _ lower-HT _ middle at the middle to middle temperature
Heat storage amount Q _ MLtoMU at middle to middle and upper temperatures
＝HT_middle_upper－HT_middle_lower
Q_MLtoMU＞0、Q_MUtoM＜0、Q_MtoML＜0
The description is as follows:
(1) the lower temperature limit T _ lower takes heat storage of a heat supply network as a reference;
(2) value ranges T _ middle _ upper, T _ middle _ lower for temperature setpoint
The heat stored in the heat supply network is adjusted by changing the given temperature value;
(3) the given temperature value is restricted by heat supply safety;
peak thermal load or peak to be entered, temperature setpoint T _ middle _ upper
Heat load valley or going to valley, temperature setpoint T _ middle _ lower
The heat load median value or the median value to be entered, the temperature setpoint T _ middle.
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