CN107181271B - Power peak regulation system and method thereof - Google Patents
Power peak regulation system and method thereof Download PDFInfo
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- CN107181271B CN107181271B CN201710582546.6A CN201710582546A CN107181271B CN 107181271 B CN107181271 B CN 107181271B CN 201710582546 A CN201710582546 A CN 201710582546A CN 107181271 B CN107181271 B CN 107181271B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 146
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 142
- 238000010248 power generation Methods 0.000 claims abstract description 106
- 239000001257 hydrogen Substances 0.000 claims abstract description 90
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 90
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 88
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000001301 oxygen Substances 0.000 claims abstract description 74
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 74
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000000746 purification Methods 0.000 claims abstract description 43
- 230000005611 electricity Effects 0.000 claims abstract description 22
- 239000000446 fuel Substances 0.000 claims description 31
- 238000002485 combustion reaction Methods 0.000 claims description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 238000009924 canning Methods 0.000 claims description 19
- 239000000126 substance Substances 0.000 claims description 14
- 239000003345 natural gas Substances 0.000 claims description 10
- 239000008213 purified water Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract 1
- 230000018044 dehydration Effects 0.000 description 9
- 238000006297 dehydration reaction Methods 0.000 description 9
- 239000003245 coal Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/02—Hydrogen or oxygen
- C25B1/04—Hydrogen or oxygen by electrolysis of water
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
-
- 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
- H02J15/00—Systems for storing electric energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The invention discloses an electric power peak shaving system and method, and belongs to the technical field of thermal power generation. Wherein peak shaver system includes: a control device (10) which sends a control instruction to the water electrolysis device (20) according to the current demand load and/or the current time; an electrolysis water device (20) for electrolyzing water to generate gas by using electric energy output by the thermal power generation system according to the control instruction; the gas purification device (30), the input communicates electrolysis water installation (20), and output intercommunication thermal power generation system can realize electric power peak regulation effect in arbitrary period, can utilize the electric energy again with water electrolysis for hydrogen and oxygen, the rethread burns hydrogen and oxygen and generates electricity, has reduced carbon emission.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to an electric power peak regulation system and method of a thermal power plant.
Background
It is known that electric energy cannot be stored, so that a user needs more electric energy, and a power plant needs more electric energy to be synchronously generated, so that energy waste is avoided. However, in a power system, the required electric load of each power plant is constantly changed, so that in order to maintain the active power balance and keep the system frequency stable, the power generation department needs to correspondingly change the power generation amount of the generator to adapt to the change of the electric load, which is called peak shaving and frequency modulation.
In recent years, in the three North China, the electric power market capacity is rich, peak-adjustable power supplies such as a fuel engine, a pumped storage and the like are scarce, the contradiction between the peak-adjustment and frequency modulation of a power grid and the flexibility of a thermal power unit is outstanding, the capacity of the power grid for absorbing new energy sources such as wind power, photoelectricity, hydropower and nuclear power is insufficient, and the phenomena of wind discarding, light discarding, water discarding and nuclear discarding are serious.
In the prior art, a thermal generator set operates in a thermoelectric mode, and the peak regulation and frequency modulation capacity of the heat supply unit is only about 10% due to thermoelectric coupling in winter. With the implementation of 22 thermal power flexibility demonstration projects developed by the energy bureau in 2016, the peak shaving and frequency modulation in winter in the future can be relieved to a certain extent. But how to adjust peak and frequency in summer besides load reduction or shutdown of a unit, especially to ensure economy of a thermal power plant while increasing peak and frequency adjustment in summer, is a difficult problem in front of a plurality of thermal power plants.
In addition, the global climate warming and the climate change coping are both carried out, and specific requirements are put forward on the carbon emission intensity of the five-power-group coal-fired thermal power unit in China in the emission reduction task promised by the China government and the thirteen-energy planning, namely, the average carbon emission intensity of the five-power coal-fired thermal power unit is 650kgCO2/kWh by 2020. In the future, thermal power generation needs to be changed into thermal power plants with low carbon emission intensity by purchasing green certificates or carbon indexes to maintain annual power generation load.
Disclosure of Invention
According to the invention, the current demand load and/or the current time of the power grid are obtained through the control device, the current time period is judged to be the electricity consumption peak period or the electricity consumption valley period according to the current demand load and/or the current time of the power grid, and then the water electrolysis device is controlled to carry out electric power peak regulation according to the peak period and the valley period. And the electric energy consumed by the water electrolysis device and the purified water treated by the chemical water treatment system convert the electric energy into chemical energy. The gas purification device carries out impurity removal, dehydration and storage treatment on hydrogen and oxygen generated by electrolyzed water, and can directly sell pure hydrogen and pure oxygen to the outside or convey the stored hydrogen and oxygen to a multi-fuel burner of a boiler of a thermal power generation system for full combustion. The utility model discloses a can realize electric power peak shaving frequency modulation effect at any period at any time to can utilize the electric energy to electrolyze water into hydrogen and oxygen, rethread burning hydrogen and oxygen generates electricity, reduce the carbon emission.
According to one aspect of an embodiment of the present invention, a power peak shaving system includes: the control device is used for acquiring the current demand load and/or the current time of the power grid, and sending a control instruction to the water electrolysis device according to the current demand load and/or the current time so as to control the electric energy use of the water electrolysis device; the water electrolysis device is electrically connected with the thermal power generation system and is used for electrolyzing water by using the electric energy output by the thermal power generation system according to the control instruction so as to generate gas; and the input end of the gas purifying device is communicated with the water electrolysis device, and the output end of the gas purifying device is communicated with the thermal power generation system.
Further, the thermal power generation system includes: a multi-fuel burner; the multi-fuel burner is communicated with the output end of the gas purifying device and is used for receiving the gas generated by the gas purifying device and sending the gas into the boiler as fuel or as combustion improver.
Further, the gas cleaning device includes: a hydrogen purification module and an oxygen purification module; the hydrogen input end of the hydrogen purification module is communicated with the water electrolysis device, and the hydrogen output end of the hydrogen purification module is communicated with the multi-fuel burner; and the oxygen output end of the oxygen purification module is communicated with the water electrolysis device, and the oxygen output end of the oxygen purification module is communicated with the multi-fuel burner.
Further, the power peak shaving system further includes: and the output end of the chemical water treatment device is communicated with the water electrolysis device and is used for treating chemical water into purified water and conveying the purified water to the water electrolysis device.
Further, the control instruction includes: start command, stop command and electrolysis regulation command, the electrolysis regulation command includes: the electrolysis accelerating instruction and the electrolysis slowing instruction are used for controlling the water electrolysis device to increase electric power; the instruction for slowing down electrolysis is to control the water electrolysis device to reduce electric power.
Further, the power peak shaving system further includes: the canning system comprises a hydrogen canning system and an oxygen canning system, wherein the hydrogen canning system is connected with the output end of the hydrogen purification module, and the oxygen canning system is connected with the output end of the oxygen purification module so as to respectively bear hydrogen and oxygen output by the hydrogen purification module and the oxygen purification module; or (b)
And one end of the pipeline conveying system is connected with the output end of the hydrogen purification module, and the other end of the pipeline conveying system is connected with a natural gas conveying pipeline and is used for conveying hydrogen in the hydrogen purification module into the natural gas conveying pipeline.
Further, the control device includes: the acquisition module is used for acquiring the current demand load and/or the current time of the power grid; the judging module is used for comparing the current demand load and/or the current time of the power grid with the current power generation load and a preset time table, and judging that the current power consumption is in a valley period or a peak period; the control module is used for executing the following operations according to the judging result of the judging module: when the judging result is in the valley period, the control module sends a control instruction to the water electrolysis device to control the water electrolysis device to start; and when the judging result is the peak period, the control module sends a control instruction to the water electrolysis device to control the water electrolysis device to stop.
Further, the control module includes: a difference calculation unit that calculates a current load difference between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculates a historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before a predetermined time, and calculates a total load difference between the current load difference and the historical load difference; and an adjusting unit for executing the following operations according to the calculation result of the difference calculating unit: if the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an electrolysis accelerating instruction to the water electrolysis device; and if the total load difference value of the current load difference value and the historical load difference value is a negative number, sending an electrolysis slowing instruction to the water electrolysis device.
According to another aspect of an embodiment of the present invention, a power peak shaving method includes: step S101: acquiring the current demand load and/or the current time of a power grid; step S102: comparing the current demand load and/or the current time of the power grid with the current power generation load and a preset time table; step S103: judging whether the current time period is the electricity consumption peak period or the electricity consumption valley period according to the comparison result; step S104: when the judging result is in the valley period, the control module sends a control instruction to the water electrolysis device to control the water electrolysis device to start; step S105: and when the judgment result is the peak period, the control module sends a control instruction to the water electrolysis device to control the water electrolysis device to stop.
Further, the control module sending a control instruction to the water electrolysis device to control the water electrolysis device to start further comprises: step S1041: calculating a current load difference value between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculating a historical load difference value between the power generation load of the thermal power generation system and the demand load of the power grid before a preset time; step S1042: if the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an electrolysis accelerating instruction to the water electrolysis device; step S1043: and if the total load difference value of the current load difference value and the historical load difference value is a negative number, sending an electrolysis slowing instruction to the water electrolysis device.
The electric power peak regulation system and the method thereof achieve the effect of electric power peak regulation and frequency modulation by arranging the control device, the water electrolysis device and the gas purification device. Firstly, a control device obtains the current demand load and/or the current time of a current power grid to a power plant, controls an electrolysis water device to consume electric energy according to the current demand load and/or the current time of the current power grid to the power plant, converts the electric energy into chemical energy, and transmits hydrogen and oxygen generated by electrolysis water to a gas purification device, and the gas purification device performs impurity removal and dehydration storage treatment on the hydrogen and oxygen, so that pure hydrogen and pure oxygen can be sold directly to the outside, and the stored hydrogen and oxygen can be transmitted to a multi-fuel burner of a boiler of a thermal power generation system for full combustion. The electric power peak regulation effect can be realized at any time, water can be electrolyzed into hydrogen and oxygen by utilizing electric energy, and then the hydrogen and the oxygen are combusted to generate electricity, so that the carbon emission is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an electric power peak shaving system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control device of an electric power peak shaving system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a control module of an electric power peak shaving system according to an embodiment of the present invention;
FIG. 4 is a flowchart of a power peak shaving method according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for peak shaving in the off-peak period according to an embodiment of the present invention.
Reference numerals: the system comprises a boiler 1, a steam turbine 2, a generator 3, a booster station 4, a condenser 5, a deaerator 60, a high-pressure heater 61, a low-pressure heater 62, a multi-fuel burner 7, a chemical water treatment device 8, a control device 10, an electrolytic water device 20, a gas purifying device 30, a canning system 40, a pipeline conveying system 50, a hydrogen purifying module 31, an oxygen purifying module 32, an acquisition module 11, a judging module 12, a control module 13, a difference calculating unit 131 and an adjusting unit 132.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The flexibility of the thermal power generation system comprises two layers of meanings, namely the flexibility of the power generation load realizes the deep peak regulation of the flexibility of the power generation load through the running of electrolyzed water or low load of a boiler, and the flexibility of the fuel of the thermal power plant creatively realizes that hydrogen and oxygen enter a hearth of a pulverized coal boiler of a power station respectively for combustion supporting and stable combustion through the multi-fuel burner provided by the invention, and the burner can be further used for introducing other gas fuels such as biomass gas and natural gas into the pulverized coal boiler for combustion in the future, so that the flexibility of the fuel of the thermal power plant is truly realized.
The invention combines the flexibility deep peak regulation of the thermal power generation system with the water electrolysis device, utilizes the surplus peak regulation electric quantity to produce hydrogen and oxygen with sufficient purity through the water electrolysis device, sends all the hydrogen and partial oxygen into the pulverized coal boiler, combines the hydrogen and the oxygen in a hearth through a special multi-fuel burner to efficiently burn, not only can reduce the coal consumption of a unit, but also can realize the stable combustion of pure hydrogen and pure oxygen under the condition of low-load combustion of the boiler, and can realize the low-load stable combustion of the boiler so as to achieve the flexibility peak regulation load of the unit. In addition, the combustion product of the hydrogen is water, no carbon emission and pollutant emission exist, the carbon emission intensity and pollutant emission amount of the coal-fired thermal power unit can be integrally reduced, and the ultra-low emission requirement of the large-scale coal-fired thermal power unit is indirectly realized.
Referring to fig. 1, fig. 2, and fig. 3, fig. 1 is a schematic structural diagram of an electric power peak shaving system according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a control device of an electric power peak shaving system according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a control module of an electric power peak shaving system according to an embodiment of the present invention.
As shown in fig. 1, 2, and 3, the power peak shaving system includes: control device 10, electrolytic water device 20 and gas purifying device 30.
The control device 10 is used for acquiring the current demand load and/or the current time of the power grid, and sending a control instruction to the water electrolysis device 20 according to the current demand load and/or the current time so as to control the electric energy use of the water electrolysis device. Specifically, the first way is to obtain the current demand load of the power grid, where the current demand load of the power grid includes the current demand load of the power grid to the power plant and the power generation load data of the current power plant. And judging that the current time is a power consumption peak period or a valley period according to the current demand load of the power plant and the power generation load of the power plant by the power grid, wherein if the difference value between the current power generation load and the current demand load is a positive number and the ratio of the difference value to the power generation rated load of the power plant is more than 10%, the current time is the valley period, and if the difference value between the current power generation load and the current demand load is a positive number and the ratio of the difference value to the power generation rated load of the power plant is not more than 10% or the difference value between the current power generation load and the current demand load is a negative number, the current time is the peak period. The second way is to obtain the current time, and judge that the current time period is the electricity consumption peak period or the electricity consumption valley period based on the current time and a preset time table, for example, the current time period is the peak period in the preset time table, the current time period is the peak period if the current time period is in the preset time table, and the current time period is the valley period if the current time period is not in the preset time table. The third mode is to comprehensively judge that the current time period is the electricity consumption peak period or the electricity consumption valley period by combining the current demand load of the current power grid to the power plant and the current time. When the determination result is the valley period, the control device 10 sends a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to start; when the determination result is the peak period, the control device 10 transmits a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to stop. Wherein the control instruction comprises: start command, stop command and electrolysis regulation command, the electrolysis regulation command includes: the method comprises the steps of accelerating an electrolysis instruction and slowing down the electrolysis instruction, wherein the accelerating the electrolysis instruction is to control the water electrolysis device to increase electric power; slowing down the electrolysis command is to control the water electrolysis device to reduce the electric power. .
When the off-peak period is judged, the current demand load of the current power grid on the power plant in the off-peak period is less, so that peak shaving is required to be carried out greatly. And stores large amounts of hydrogen and oxygen for use during peak hours. Firstly, calculating a current load difference value between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculating a historical load difference value between the power generation load of the thermal power generation system and the demand load of the power grid before a preset time. And then calculating the total load difference value of the current load difference value and the historical load difference value. If the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an instruction for accelerating electrolysis to the water electrolysis device 20; and if the total load difference between the current load difference and the historical load difference is negative, sending an electrolysis slowing instruction to the water electrolysis device 20.
When the peak period is judged, the current demand load of the current power grid on the power plant is high in the peak period, and the power plant is required to generate power with the maximum capacity for the user. And the stored large amounts of hydrogen and oxygen are fed to the multi-fuel burner 7 of the thermal power generation system boiler for combustion.
The water electrolysis device 20 is electrically connected with the thermal power generation system and is used for electrolyzing water by using electric energy output by the thermal power generation system according to control instructions to generate gas. Specifically, the thermal power generation system is a thermal power generation system commonly found in the prior art. The water electrolysis device 20 is used for consuming surplus electric energy produced by the thermal power generation system. Is electrically connected with a thermal power generation system; the output end of the device is connected with the input end of the gas purifying device 30 through a pipeline, and the device is used for conveying hydrogen and oxygen generated by electrolysis of water to the gas purifying device 30. When a control instruction is received to accelerate the electrolysis instruction, the electrolysis efficiency is accelerated, namely the electricity consumption generated by the thermal power generation system is increased; when a control instruction is received to slow down the electrolysis instruction, the electrolysis efficiency is slowed down, namely the electricity consumption generated by the thermal power generation system is reduced. And delivers hydrogen and oxygen generated after electrolysis to the gas cleaning device 30.
The gas purifying device 30, the input end of which is communicated with the water electrolysis device 20, and the output end of which is communicated with the thermal power generation system; specifically, the gas purifying device 30 is configured to receive the gas generated by the water electrolysis device 20, that is, to receive the hydrogen gas and the oxygen gas generated by the water electrolysis device 20, and to purify the gas. Wherein the gas cleaning device 30 comprises a wash tank, a dehydration tank, and a buffer tank; the washing tank is used for removing impurities from the gas, the dehydration tank is used for dehydrating the gas, and the buffer tank is used for storing the gas. The gas purifying device 30 delivers the purified gas to the thermal power generation system.
Preferably, the thermal power generation system includes: a multi-fuel burner 7; the multi-fuel burner 7 is communicated with an output end of the gas cleaning device 30 for receiving the gas generated by the gas cleaning device 30 and delivering the gas into the boiler as fuel or as combustion improver. The specific multi-fuel burner 7 enables hydrogen to be combined with oxygen in a hearth for high-efficiency combustion, so that the coal consumption of the thermal power generation system can be reduced, pure hydrogen and pure oxygen can play a role in stable combustion under the condition of low-load combustion of a boiler, and the low-load stable combustion of the boiler can be realized, so that the flexibility peak shaving of the thermal power generation system is achieved.
Preferably, the gas cleaning device 30 includes: a hydrogen purge module 31 and an oxygen purge module 32; the hydrogen purification module 31, the hydrogen input end of which is communicated with the water electrolysis device 20, and the hydrogen output end of which is communicated with the multi-fuel burner 7; an oxygen purification module 32, the oxygen output end of which is communicated with the water electrolysis device 20, and the oxygen output end of which is communicated with the multi-fuel burner 7; specifically, the hydrogen purification module 31 is configured to receive hydrogen generated by the water electrolysis device 20, purify the hydrogen, and convey the purified hydrogen to the thermal power generation system; the oxygen purification module 32 is configured to receive oxygen generated by the water electrolysis device 20, purify the oxygen, and deliver the purified oxygen to the thermal power generation system. Wherein the hydrogen purification module 31 includes a hydrogen purge tank, a hydrogen dehydration tank, and a hydrogen buffer tank; the hydrogen washing tank is used for removing impurities from hydrogen, the hydrogen dehydration tank is used for dehydrating the hydrogen, and the hydrogen buffer tank is used for storing the hydrogen. The oxygen purification module 32 includes an oxygen scrubber tank, an oxygen dehydration tank, and an oxygen buffer tank; the oxygen washing tank is used for removing impurities from oxygen, the oxygen dehydration tank is used for dehydrating the oxygen, and the oxygen buffer tank is used for storing the oxygen.
Preferably, the output end of the chemical water treatment device 8 is communicated with the water electrolysis device 20, and is used for treating chemical water into purified water and conveying the purified water to the water electrolysis device 20. Specifically, the water electrolyzed in the water electrolysis apparatus 20 is the purified water provided by the chemical water treatment apparatus 8. The chemical water treatment apparatus 8 cleans the chemical water to obtain purified water, and delivers the purified water to the electrolysis water apparatus 20 to electrolyze the electrolysis water apparatus 20.
Preferably, the power peak shaving system further comprises: the canning system 40 and the tubing system 50. Wherein the canning system 40 comprises a hydrogen canning system and an oxygen canning system, the hydrogen canning system is connected with the output end of the hydrogen purification module 31, and the oxygen canning system is connected with the output end of the oxygen purification module 32 so as to respectively bear the hydrogen and the oxygen output by the hydrogen purification module 31 and the oxygen purification module 32. The hydrogen canning system and the oxygen canning system respectively fill hydrogen and oxygen into the high-pressure steel bottle so as to facilitate the outward sales. And a pipeline transportation system 50, one end of which is connected with the output end of the hydrogen purification module 31, and the other end of which is connected with the natural gas transportation pipeline, for sending the hydrogen in the hydrogen purification module 31 into the natural gas transportation pipeline. The hydrogen and the natural gas can be mixed and then are pumped into a natural gas long-distance transportation pipeline for long-distance transportation and sales.
Preferably, the control device 10 includes: an obtaining module 11, configured to obtain a current demand load and/or a current time of the power grid; the judging module 12 is configured to compare a current demand load and/or a current time of the power grid with a current power generation load and a preset time table, and judge that the current power consumption is in a valley period or a peak period; the control module 13 performs the following operations according to the determination result of the determination module 12: when the judging result is the valley period, the control module 13 sends a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to start; and when the judgment result is the peak period, the control module 13 sends a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to stop. Specifically, the first acquiring module 11 acquires a current demand load and/or a current time of the power grid, where the current demand load of the power grid includes: and acquiring current demand load of the current power grid to the power plant and generating load data of the current power plant. The judging module 12 compares the obtained current demand load and/or current time of the power grid with the current power generation load and a preset time table. The current demand load and the current power generation load of the power plant can be compared independently, if the difference value between the current power generation load and the current demand load is positive, and the ratio of the difference value to the power generation rated load of the power plant is more than 10% in the electricity valley period, if the difference value between the current power generation load and the current demand load is positive, and the ratio of the difference value to the power generation rated load of the power plant is not more than 10% or the difference value between the current power generation load and the current demand load is negative, the peak period is the peak period; the current time and the preset time table can be compared independently, for example, the peak period is in the preset time table if the current time is in the preset time table, and the valley period is in the preset time table if the current time is not in the preset time table; the current demand load of the current power grid to the power plant and the current power generation load can be compared, the current time is compared with a preset time table, and the two comparison results are combined. And obtaining the current time period as the electricity consumption peak period or the electricity consumption valley period according to the comparison result.
Preferably, the control module 13 comprises: a difference calculation unit 131 that calculates a current load difference between a current power generation load of the thermal power generation system and a current demand load of the power grid, and a historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before a predetermined time, and calculates a total load difference between the current load difference and the historical load difference; an adjusting unit 132 that performs the following operations according to the calculation result of the difference calculating unit 131: if the total load difference between the current load difference and the historical load difference is positive, an instruction for accelerating electrolysis is sent to the water electrolysis device 20, and if the total load difference between the current load difference and the historical load difference is negative, an instruction for slowing electrolysis is sent to the water electrolysis device 20.
Referring to fig. 4 and fig. 5, fig. 4 is a flowchart of a power peak shaving method according to an embodiment of the present invention; fig. 5 is a flowchart of a method for peak shaving in the off-peak period according to an embodiment of the present invention.
Step S101: acquiring the current demand load and/or the current time of a power grid;
specifically, the current demand load of the power grid includes obtaining current demand load of the current power grid to the power plant and generating load data of the current power plant.
Step S102: comparing the current demand load and/or the current time of the power grid with the current power generation load and a preset time table;
specifically, the current demand load of the current power grid to the power plant and the current power generation load can be compared independently; the current time can also be compared with a preset time table independently; the current demand load of the current power grid to the power plant and the current power generation load can be compared, the current time is compared with a preset time table, and the two comparison results are combined.
Step S103: judging whether the current time period is the electricity consumption peak period or the electricity consumption valley period according to the comparison result;
specifically, the current power generation load and a preset schedule are preset, wherein the preset schedule is a valley period. The peak period may also be set in a preset schedule. The present embodiment is illustrated with peak hours within a predetermined schedule. When the current demand load and the current power generation load of the power plant are compared by the current power grid alone, if the difference value between the current power generation load and the current demand load is positive, and the ratio of the difference value to the power generation rated load of the power plant is more than 10% in the electricity valley period, if the difference value between the current power generation load and the current demand load is positive, and the ratio of the difference value to the power generation rated load of the power plant is not more than 10% or the difference value between the current power generation load and the current demand load is negative, the peak period is reached. When the current time is compared with the preset time table independently, the current time is a peak period if the current time is in the preset time table, and is a valley period if the current time is not in the preset time table. The method can also compare the current demand load of the power plant by the current power grid with the current power generation load, compare the current time with a preset time table, and select a more optimized result by combining the two comparison results.
Step S104: when the determination result is the valley period, the control module 13 sends a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to start.
Specifically, step S104 further includes: step S1041: calculating a current load difference value between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculating a historical load difference value between the power generation load of the thermal power generation system and the demand load of the power grid before a preset time; step S1042: if the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an electrolysis accelerating instruction to the water electrolysis device 20; step S1043: and if the total load difference between the current load difference and the historical load difference is negative, sending an electrolysis slowing instruction to the water electrolysis device 20. When the off-peak period is judged, peak shaving is required to be carried out greatly because the current demand load of the current power grid on the power plant in the off-peak period is less. And stores large amounts of hydrogen and oxygen for use during peak hours. Firstly, calculating a current load difference value between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculating a historical load difference value between the power generation load of the thermal power generation system and the demand load of the power grid before a preset time. And then calculating the total load difference value of the current load difference value and the historical load difference value. If the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an instruction for accelerating electrolysis to the water electrolysis device 20; and if the total load difference between the current load difference and the historical load difference is negative, sending an electrolysis slowing instruction to the water electrolysis device 20. The electrolysis accelerating instruction is to control the water electrolysis device 20 to increase the electric power; slowing down the electrolysis command controls the water electrolysis device 20 to reduce the electric power.
Step S105: when the determination result is the peak period, the control module 13 sends a control instruction to the water electrolysis device 20 to control the water electrolysis device 20 to stop.
Specifically, when the peak period is determined, the current demand load of the current power grid on the power plant is high in the peak period, and the power plant is required to generate power with the maximum capacity for the user. And the stored large amounts of hydrogen and oxygen are fed to the multi-fuel burner 7 of the thermal power generation system boiler for combustion.
The electric power peak regulation system and the method thereof achieve the effect of electric power peak regulation and frequency modulation by arranging the control device, the water electrolysis device and the gas purification device. Firstly, a control device obtains the current demand load and/or the current time of a current power grid to a power plant, controls an electrolysis water device to consume electric energy according to the current demand load and/or the current time of the current power grid to the power plant, converts the electric energy into chemical energy, conveys hydrogen and oxygen generated by electrolysis water to a gas purification device, performs impurity removal and dehydration storage treatment on the hydrogen and oxygen by the gas purification device, and conveys the stored hydrogen and oxygen to a multi-fuel burner of a boiler of a thermal power generation system for full combustion. The electric power peak regulation and frequency modulation effect can be realized at any time, water can be electrolyzed into hydrogen and oxygen by utilizing electric energy, and then the hydrogen and the oxygen are combusted to generate electricity, so that the carbon emission is reduced.
The water electrolysis device directly reduces the on-line electric quantity of the thermal power generation system, provides peak regulation load for the power grid all the year round, indirectly utilizes the waste wind, waste light, waste water and waste nuclear power, and relieves the problems of power grid balance and peak-valley difference. And the hydrogen and partial oxygen produced by the water electrolysis device can be sent into the pulverized coal boiler for combustion, so that the low-load stable combustion of the boiler of the large-scale thermal power generation system can be realized, the load range of the low-load peak regulation of the boiler is improved, and the peak regulation capacity of the thermal power generation system is improved. The power consumption of the water electrolysis device can be adjusted steplessly, namely the power supply power of the water electrolysis device can be changed randomly and rapidly from 50% load to 100%, and the frequency modulation service of a power grid can be realized. The multi-fuel burner provided by the invention creatively realizes that hydrogen and oxygen respectively enter the hearth of the pulverized coal boiler of the power station to support combustion and stabilize combustion, and can be further used for introducing other gas fuels such as biomass gas and natural gas into the pulverized coal boiler for combustion in the future, so that the flexibility of the fuel of the thermal power plant is truly realized.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (8)
1. An electrical peak shaving system, comprising:
the control device (10) is used for acquiring the current demand load and/or the current time of the power grid and sending a control instruction to the water electrolysis device (20) according to the current demand load and/or the current time so as to control the electric energy use of the water electrolysis device;
the control device (10) comprises:
the acquisition module (11) is used for acquiring the current demand load and/or the current time of the power grid;
the judging module (12) is used for comparing the current demand load and/or the current time of the power grid with the current power generation load and a preset time table and judging whether the current power consumption is in a valley period or a peak period;
a control module (13) for executing the following operations according to the judging result of the judging module (12): when the judging result is in the valley period, the control module (13) sends a control instruction to the water electrolysis device (20) to control the water electrolysis device (20) to start; and when the judgment result is a peak period, the control module (13) sends a control instruction to the water electrolysis device (20) to control the water electrolysis device (20) to stop;
the control module (13) comprises:
a difference calculation unit (131) that calculates a current load difference between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculates a historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before a predetermined time, and calculates a total load difference between the current load difference and the historical load difference;
an adjustment unit (132) that performs the following operations according to the calculation result of the difference calculation unit (131):
if the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an instruction for accelerating electrolysis to the water electrolysis device (20); if the total load difference value of the current load difference value and the historical load difference value is negative, sending an electrolysis slowing instruction to the water electrolysis device (20);
the water electrolysis device (20) is electrically connected with the thermal power generation system and is used for electrolyzing water by using the electric energy output by the thermal power generation system according to the control instruction so as to generate gas;
and the input end of the gas purifying device (30) is communicated with the water electrolysis device (20), and the output end of the gas purifying device is communicated with the thermal power generation system.
2. The power peak shaver system according to claim 1, wherein,
the thermal power generation system includes: a multi-fuel burner (7);
the multi-fuel burner (7) is communicated with the output end of the gas purifying device (30) and is used for receiving the gas generated by the gas purifying device (30) and sending the gas into the boiler as fuel or as combustion improver.
3. The power peaking system of claim 2, wherein the gas cleaning device (30) comprises: a hydrogen purification module (31) and an oxygen purification module (32);
the hydrogen input end of the hydrogen purification module (31) is communicated with the water electrolysis device (20), and the hydrogen output end of the hydrogen purification module is communicated with the multi-fuel burner;
the oxygen purification module (32) is provided with an oxygen output end communicated with the water electrolysis device (20), and an oxygen output end communicated with the multi-fuel burner.
4. The power peaking system of claim 1, further comprising:
and the output end of the chemical water treatment device (8) is communicated with the water electrolysis device (20) and is used for treating chemical water into purified water and conveying the purified water to the water electrolysis device (20).
5. The power peak shaver system according to claim 1, wherein,
the control instruction includes: start command, stop command and electrolysis regulation command, the electrolysis regulation command includes:
accelerating electrolysis instructions and slowing electrolysis instructions;
the instruction for accelerating electrolysis is to control the water electrolysis device (20) to increase electric power;
the instruction for slowing down electrolysis is to control the water electrolysis device (20) to reduce electric power.
6. The power peaking system of claim 3, further comprising:
the canning system (40) comprises a hydrogen canning system and an oxygen canning system, wherein the hydrogen canning system is connected with the output end of the hydrogen purification module (31), and the oxygen canning system is connected with the output end of the oxygen purification module (32) so as to respectively bear the hydrogen and the oxygen output by the hydrogen purification module (31) and the oxygen purification module (32); or (b)
And one end of the pipeline conveying system (50) is connected with the output end of the hydrogen purification module (31), and the other end of the pipeline conveying system is connected with a natural gas conveying pipeline and is used for conveying hydrogen in the hydrogen purification module (31) into the natural gas conveying pipeline.
7. A power peaking method applied to the power peaking system of any one of claims 1-6, the method comprising:
step S101: acquiring the current demand load and/or the current time of a power grid;
step S102: comparing the current demand load and/or the current time of the power grid with the current power generation load and a preset time table;
step S103: judging whether the current time period is the electricity consumption peak period or the electricity consumption valley period according to the comparison result;
step S104: when the judging result is in the valley period, the control module (13) sends a control instruction to the water electrolysis device (20) to control the water electrolysis device (20) to start;
step S105: when the judgment result is the peak period, the control module (13) sends a control instruction to the water electrolysis device (20) to control the water electrolysis device (20) to stop.
8. The power peaking method of claim 7, wherein the control module (13) directs the electrolyzed water apparatus (20)
Sending control instructions to control the actuation of the water electrolysis device (20) further comprises:
step S1041: calculating a current load difference value between a current power generation load of the thermal power generation system and a current demand load of the power grid, and calculating a historical load difference value between the power generation load of the thermal power generation system and the demand load of the power grid before a preset time;
step S1042: if the total load difference value of the current load difference value and the historical load difference value is a positive number, sending an instruction for accelerating electrolysis to the water electrolysis device (20);
step S1043: and if the total load difference value of the current load difference value and the historical load difference value is negative, sending an instruction for slowing down electrolysis to the water electrolysis device (20).
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| WO2019014820A1 (en) * | 2017-07-17 | 2019-01-24 | 赫普热力发展有限公司 | Method and system for regulating peak electrical power |
| CN107806625A (en) * | 2017-11-21 | 2018-03-16 | 赫普科技发展（北京）有限公司 | The system that a kind of boiler load adjustment combines outside peak-frequency regulation equipment |
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