WO2019014820A1 - Method and system for regulating peak electrical power - Google Patents

Abstract

The present invention relates to the technical field of thermalelectric power generation. Disclosed are a method and system for regulating peak electrical power. The system for regulating peak electrical power comprises: a control device (10), for transmitting a control instruction to a water electrolysis device (20) according to a current load demand and/or a current time; the water electrolysis device (20), for electrolyzing water using an electrical energy output from a thermalelectric power generation system according to the control instruction to produce gas; and a gas purification device (30), an input end thereof being in communication with the water electrolysis device (20) and an output end thereof being in communication with the thermalelectric power generation system. The present invention can regulate peak electrical power at any time period, electrolyze water into hydrogen and oxygen using the electrical energy, and then generate power by burning the hydrogen and oxygen, thereby reducing carbon emission.

Description

Electric power peaking system and method thereof Technical field

The invention relates to the technical field of thermal power generation, in particular to a power peak shaving system and a method thereof for a thermal power plant.

Background technique

It is well known that electrical energy cannot be stored, so how much power the user needs, and how much power the power plant needs to be synchronized, so that no energy is wasted. However, in general, the demand electric load of each power plant in the power system is constantly changing. In order to maintain the active power balance and keep the system frequency stable, the power generation department needs to change the power generation capacity of the generator to adapt to the change of the power load. It is called peaking frequency modulation.

In recent years, the power market in the three north regions of China is rich in capacity, and the peak power supply such as gas turbines and pumped storage is scarce. The contradiction between power grid peaking and frequency modulation and thermal power unit flexibility is prominent. The grid consumes wind power, photovoltaic, hydropower and nuclear power. The ability to wait for new energy sources is insufficient, and the phenomenon of abandoning wind, abandoning light, abandoning water and abandoning nuclear is serious.

In the prior art, the thermal power generating unit operates in a "heat-set" mode, and the peaking and frequency-modulating capability of the heating unit is only about 10% due to the thermoelectric coupling in winter. With the implementation of 22 thermal power flexibility demonstration projects launched by the Energy Bureau in 2016, the peak frequency modulation in the winter can be relieved to some extent. However, in the summer, in addition to the unit's load reduction or shutdown, how to adjust the peak frequency, especially to increase the summer peak frequency and ensure the economic efficiency of the thermal power plant, is a difficult problem in front of many thermal power plants.

In addition, global warming and climate change, the Chinese government promised emission reduction tasks and the 13th Five-Year Energy Plan have proposed carbon emission intensity for coal-fired thermal power units of the five major power groups in China. The body requirements, that is, by 2020, the average carbon emission intensity of the five major coal-fired thermal power units should be 650kgCO2/kWh. In the future, thermal power generation will need to purchase a green certificate or carbon indicator to maintain the annual power generation load, or it will need to change the fuel to become a low-carbon intensity thermal power plant.

Summary of the invention

The invention obtains the current demand load and/or the current time of the power grid through the control device, determines the current time period as the peak period or the low valley period according to the current demand load of the power grid and/or the current time, and then controls the electrolyzed water according to the peak period and the trough period. The device performs power peak shaving. The electrical energy consumed by the electrolyzed water device and the purified water treated by the chemical water treatment system convert electrical energy into chemical energy. The gas purifying device performs the dephosphorization and storage treatment of the hydrogen and oxygen generated by the electrolyzed water, and can directly sell pure hydrogen pure oxygen to the outside, or can transport the stored hydrogen oxygen to the multi-fuel burner of the thermal power generation system boiler for full combustion. The application can realize the power peak frequency modulation effect at any time in any time, and can use electricity to electrolyze water into hydrogen and oxygen, and then generate electricity by burning hydrogen and oxygen, thereby reducing carbon emissions.

According to an aspect of an embodiment of the present invention, a power peaking system includes: control means for acquiring a current demand load and/or a current time of a power grid, and according to the current demand load and/or current time to a water electrolysis device Sending a control command to control its power usage; the electrolysis water device is electrically connected to the thermal power generation system for electrolyzing the water to generate gas according to the control command using the output power of the thermal power generation system; the gas purifying device, the input end thereof The electrolysis water device is connected, and an output end thereof communicates with the thermal power generation system.

Further, the thermal power generation system includes: a multi-fuel burner; the multi-fuel burner is in communication with an output end of the gas purification device for receiving a gas generated by the gas purification device, and using the gas as a fuel Or as a combustion improver into the boiler.

Further, the gas purification device includes: a hydrogen purification module and an oxygen purification module; the hydrogen purification module has a hydrogen input end connected to the electrolysis water device, and a hydrogen output end thereof communicates with the multi-fuel burner; the oxygen purification device A module having an oxygen output end connected to the electrolysis water unit, the oxygen output end of which is coupled to the multi-fuel burner.

Further, the power peaking system further includes: a chemical water treatment device, the output end of which is connected to the electrolysis water device for treating the chemical water into pure water, and delivering the purified water to the electrolysis water device.

Further, the control command includes: a start command, a stop command, and an electrolysis adjustment command, the electrolysis adjustment command includes: accelerating the electrolysis command and slowing down the electrolysis instruction, and the accelerating the electrolysis command increases the electric power of the electrolyzed water device; The slow electrolysis command reduces the electric power of the electrolysis water device.

Further, the power peaking system further includes: a canning system including a hydrogen tank system and an oxygen tank system, the hydrogen tank system being connected to an output of the hydrogen purification module, the oxygen tank system and oxygen purification The outputs of the modules are connected to respectively carry hydrogen and oxygen output by the hydrogen purification module and the oxygen purification module; or

The pipeline transportation system has one end connected to the output end of the hydrogen purification module and the other end connected to the natural gas transmission pipeline for feeding the hydrogen in the hydrogen purification module into the natural gas transmission pipeline.

Further, the control device includes: an obtaining module, configured to acquire a current demand load and/or a current time of the power grid; and a determining module, configured to use the current demand load and/or the current time of the power grid with the current power generation load and the preset time schedule. Performing an alignment, and determining that the current power consumption is a trough period or a peak period; the control module performs the following operations according to the determination result of the judging module: when the determination result is a trough period, the control module sends a control to the electrolysis water device Command to control the activation of the electrolysis water device; When the determination result is a peak period, the control module sends a control command to the electrolysis water device to control the electrolysis water 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 power generation load of the thermal power generation system and a demand load of the power grid before the reservation time. The historical load difference, and calculate the total load difference between the current load difference and the historical load difference; the adjusting unit performs the following operations according to the calculation result of the difference calculating unit: if the current load difference and the historical load difference If the total load difference of the value is positive, the accelerated electrolysis command is sent to the electrolysis device; if the total load difference between the current load difference and the historical load difference is negative, the slow electrolysis command is sent to the electrolyzed water device.

According to another aspect of the embodiments of the present invention, a power peak shaving method includes: step S101: acquiring a current demand load of a power grid and/or a current time; and step S102: loading a current demand load of the power grid and/or a current time Comparing with the current power generation load and the preset time schedule; Step S103: determining, according to the comparison result, that the current time period is a power peak period or a valley period; Step S104: When the determination result is a valley period, the control module sends the water to the water unit Sending a control command to control the activation of the electrolysis water device; Step S105: When the determination result is a peak period, the control module sends a control command to the electrolysis water device to control the electrolysis water device to stop.

Further, the sending, by the control module, the control command to the electrolysis device to control the activation of the electrolyzed water device further includes: step S1041: calculating a current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculating the reservation time before The historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid; step S1042: if the total load difference between the current load difference and the historical load difference is a positive number, the accelerated electrolysis command is sent to the electrolysis water device; step S1043 : If the total load difference between the current load difference and the historical load difference is negative, the transmission to the electrolysis device is slowed down. Electrolysis instructions.

The power peak shaving system and the method thereof of the invention achieve the effect of power peaking and frequency modulation by setting a control device, an electrolysis water device and a gas purifying device. First, the control device obtains the current demand load and/or current time of the current power grid to the power plant, and controls the power consumption of the electrolysis water device to convert it into chemical energy according to the current demand load and/or current time of the current power grid to the power plant, and The hydrogen oxygen generated by the electrolyzed water is sent to the gas purifying device, and the gas purifying device performs the dephosphorization and storage treatment of the hydrogen and oxygen, and can directly sell the pure hydrogen pure oxygen or the stored hydrogen oxygen to the thermal power generation system boiler. Fully burned in a multi-fuel burner. It can realize the power peak-shaving effect at any time and at any time, and can use electricity to electrolyze water into hydrogen and oxygen, and then generate electricity by burning hydrogen and oxygen, thereby reducing carbon emissions.

DRAWINGS

1 is a schematic structural diagram of a power peak shaving system according to an embodiment of the present invention;

2 is a schematic structural diagram of a control device for a power peak shaving system according to an embodiment of the present invention;

3 is a schematic structural diagram of a control module of a power peaking system according to an embodiment of the present invention;

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 of power in a trough period according to an embodiment of the present invention.

Reference numerals: 1 for boiler, 2 for steam turbine, 3 for generator, 4 for booster, 5 for condenser, 60 for deaerator, 61, high pressure heater, 62 low pressure heater, 7 for multi-fuel Burner, 8 is chemical water treatment device, 10 is control device, 20 is electrolysis water device, 30 is gas purification device, 40 is canned system, 50 is pipeline transportation system, 31 is hydrogen purification module, 32 is oxygen purification mold Blocks, 11 are acquisition modules, 12 is a determination module, 13 is a control module, 131 is a difference calculation unit, and 132 is an adjustment unit.

Detailed ways

The present invention will be further described in detail below with reference to the specific embodiments thereof and the accompanying drawings. It is to be understood that the description is not intended to limit the scope of the invention. In addition, descriptions of well-known structures and techniques are omitted in the following description in order to avoid unnecessarily obscuring the inventive concept.

The flexibility of a thermal power generation system consists of two layers. One is the flexibility of the power generation load. The depth of the power generation load is flexibly stabilized by electrolyzed water or low-load operation of the boiler. Second, the flexibility of the fuel in the thermal power plant passes through the multi-fuel burner of the present invention. Innovatively realize that hydrogen and oxygen enter the pulverized coal boiler of the power station for combustion and stable combustion, and the burner can be used for other gaseous fuels such as biomass gas and natural gas to be introduced into the pulverized coal boiler for combustion, thereby realizing the thermal power plant. Fuel flexibility.

The invention combines the flexibility peaking of the thermal power generation system with the electrolyzed water device, and uses the surplus peaking power to produce hydrogen and oxygen with sufficient purity through the electrolysis water device, and sends all the hydrogen and part of the oxygen into the pulverized coal boiler through the special The multi-fuel burner enables high-efficiency combustion of hydrogen in the furnace combined with oxygen, which not only reduces the coal consumption of the unit, but also pure hydrogen and pure oxygen can stabilize the combustion under low-load combustion of the boiler, and can achieve low boiler The load is steadily ignited to achieve the flexibility of the unit itself. In addition, the combustion products of hydrogen are water, without any carbon emissions and pollutant emissions, which can reduce the carbon emission intensity and pollutant emissions of coal-fired thermal power units as a whole, and indirectly achieve the ultra-low emission requirements of large coal-fired thermal power units.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , FIG. 1 is a schematic structural diagram of a power peak shaving system according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a power peak shaving system control apparatus according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a control module of a power peak shaving system according to an embodiment of the present invention.

As shown in FIG. 1, FIG. 2, and FIG. 3, the power peaking system includes a control device 10, an electrolysis water device 20, and a gas purifying device 30.

The control device 10 is configured to acquire a current demand load and/or a current time of the power grid, and send a control command to the electrolysis water device 20 according to the current demand load and/or the current time to control its power usage. Specifically, the first way is to obtain the current demand load of the power grid, and 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 according to the current demand load of the power grid and the current power generation load of the power plant, the current time is determined as the peak period or the low period of the power consumption, if the difference between the current power generation load and the current demand load is a positive number, and the difference and the power generation of the power plant If the ratio of the rated load is greater than 10%, it is the trough period. If the difference between the current generating load and the current demand load is positive, and the ratio of the difference to the rated load of the power plant is not more than 10% or the current generating load and the current demand load When the difference is negative, it is the peak period. The second way is to obtain the current time, and determine the current time period as the peak period or the low period based on the current time and the preset timetable, for example, the peak period in the preset time period, if the current time is within the preset time schedule. It is the peak period, and if the current time is not within the preset timetable, it is the trough period. The third way is to combine the current grid with the current demand load of the power plant and the current time comprehensive judgment. The current time period is the peak period or the low period of power consumption. When the determination result is a trough period, the control device 10 sends a control command to the electrolysis water device 20 to control the activation of the electrolysis water device 20; when the determination result is a peak period, the control device 10 sends a control command to the electrolysis water device 20 to control the electrolyzed water. Device 20 is stopped. The control commands include: a start command, a stop command, and an electrolysis adjustment command. The electrolysis adjustment command includes: accelerating the electrolysis command and slowing down the electrolysis command, accelerating the electrolysis command to increase the electric power of the electrolysis water device; and slowing down the electrolysis command The electrolysis water device reduces electric power. .

When it is judged to be a trough, since the current grid requires less load on the current power plant during the trough, it is necessary to perform peak shaving. And a large amount of hydrogen and oxygen are stored for peak use. First, calculate the current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculate the historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before the scheduled time. Then calculate the total load difference between the current load difference and the historical load difference. If the total load difference between the current load difference and the historical load difference is a positive number, an accelerated electrolysis command is sent to the electrolysis water device 20; if the total load difference between the current load difference and the historical load difference is a negative number, the electrolysis is performed. The water device 20 sends a slowing electrolysis command.

When it is judged as the peak period, due to the current high demand load of the current power grid to the power plant during the peak period, the power plant should generate power with maximum capacity for the user to use. And the stored large amount of hydrogen and oxygen are sent to the multi-fuel burner 7 of the thermal power system boiler for combustion.

The electrolysis water device 20 is electrically connected to the thermal power generation system for electrolyzing water to generate gas according to a control command using a thermal power generation system output electric energy. Specifically, the thermal power generation system is a thermal power generation system that is common in the prior art. The electrolyzed water device 20 is used to consume excess electric energy produced by the thermal power generation system. The utility model is electrically connected to the thermal power generation system; the output end thereof is connected to the input end of the gas purifying device 30 through a pipeline for conveying hydrogen and oxygen generated by the electrolyzed water to the gas purifying device 30. When receiving the control command to speed up the electrolysis command, the efficiency of electrolysis is accelerated, that is, the electric power generated by the thermal power generation system is increased; when the control command is received to slow down the electrolysis command, the efficiency of electrolysis is slowed down, that is, the consumption of thermal power is reduced. The amount of electricity generated by the system. Hydrogen and oxygen generated after the electrolysis are sent to the gas purifying device 30.

The gas purifying device 30 has an input end connected to the electrolysis water device 20, and an output end thereof is connected to the thermal power generation Specifically, the gas purifying device 30 is configured to receive the gas generated by the electrolyzed water device 20, that is, receive the hydrogen and oxygen generated by the electrolyzed water device 20, and purify the gas. The gas purifying device 30 includes a washing tank, a dehydrating tank and a buffer tank; the washing tank is used for gas removal, 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 comprises: a multi-fuel burner 7; the multi-fuel burner 7 is in communication with the output of the gas purification device 30 for receiving the gas generated by the gas purification device 30 and using the gas as a fuel or as a combustion aid Into the boiler. The specific multi-fuel burner 7 enables high-efficiency combustion of hydrogen in the furnace combined with oxygen, which not only reduces the coal consumption of the thermal power generation system, but also pure hydrogen and pure oxygen can stabilize the combustion under low-load combustion conditions of the boiler. The boiler can achieve low-load stable combustion and achieve the flexibility peaking of the thermal power generation system.

Preferably, the gas purification device 30 includes: a hydrogen purification module 31 and an oxygen purification module 32; a hydrogen purification module 31 having a hydrogen input end connected to the electrolysis water device 20, a hydrogen output end of which is connected to the multi-fuel burner 7; and an oxygen purification module 32, The oxygen output end communicates with the electrolysis water device 20, and the oxygen output end thereof communicates with the multi-fuel burner 7; specifically, the hydrogen purification module 31 is configured to receive the hydrogen gas generated by the electrolysis water device 20, and purify the hydrogen gas, and after the purification treatment The hydrogen gas is sent to the thermal power generation system; the oxygen purification module 32 is configured to receive the oxygen generated by the electrolysis water device 20, and purify the oxygen, and deliver the purified oxygen to the thermal power generation system. The hydrogen purification module 31 includes a hydrogen scrubbing tank, a hydrogen dehydrating tank, and a hydrogen buffer tank; the hydrogen scrubbing tank is used for hydrogen removal, the hydrogen dehydrating tank is used for dehydrating hydrogen, and the hydrogen buffer tank is used for storing hydrogen. The oxygen purification module 32 includes an oxygen scrubbing tank, an oxygen dehydrating tank, and an oxygen buffer tank; the oxygen scrubbing tank is used for oxygen removal, the oxygen dehydrating tank is used for dehydrating oxygen, and the oxygen buffer tank is used for oxygen. Store.

Preferably, the chemical water treatment device 8 has an output end connected to the electrolysis water device 20 for treating the chemical water into purified water and delivering the purified water to the electrolysis water device 20. Specifically, the water electrolyzed in the electrolyzed water device 20 is the treated purified water supplied from the chemical water treatment device 8. The chemical water treatment device 8 cleans the chemical water to obtain purified water, and delivers the purified water to the electrolyzed water device 20 to perform electrolysis by the electric water dissipating device 20.

Preferably, the power peak shaving system further comprises: a canning system 40 and a ducting system 50. The canning system 40 includes a hydrogen canning system and an oxygen canning system. The hydrogen canning system is connected to the output end of the hydrogen purification module 31, and the oxygen canning system is connected to the output end of the oxygen purification module 32 to respectively carry the load. The hydrogen purification module 31 and the oxygen purification module 32 output hydrogen and oxygen. The hydrogen tank system and the oxygen tank system respectively put hydrogen and oxygen into high pressure steel cylinders for convenient external sales. The pipeline transportation system 50 has one end connected to the output end of the hydrogen purification module 31 and the other end connected to the natural gas transmission pipeline for feeding the hydrogen in the hydrogen purification module 31 to the natural gas transmission pipeline. That is, hydrogen and natural gas can be blended, and then into the natural gas long-distance pipeline for long-distance transportation sales.

Preferably, the control device 10 includes: an obtaining module 11 for acquiring a current demand load and/or a current time of the power grid; and a determining module 12 for using the current demand load and/or the current time of the power grid with the current power generation load, preset The timetable is compared, and the current power consumption is determined to be a trough period or a peak period; the control module 13 performs the following operations according to the determination result of the judging module 12: when the determination result is a trough period, the control module 13 sends the electrolysis water The device 20 sends a control command to control the activation of the electrolysis water device 20; and when the determination result is a peak period, the control module 13 sends a control command to the electrolysis water device 20 to control the electrolysis water device 20 to stop. Specifically, the module 11 is first acquired to obtain the power grid. The current demand load and/or the current time, wherein the current demand load of the power grid includes: obtaining the current demand load of the current power grid to the power plant and the power generation load data of the current power plant. The judging module 12 compares the current demand load and/or the current time of the acquired power grid with the current power generation load and the preset time schedule. The current demand load of the current power grid to the power plant can be compared with the current power generation load separately. If the difference between the current power generation load and the current demand load is a positive number, and the ratio of the difference to the power generation rated load of the power plant is greater than 10%, the power is During the trough, if the difference between the current generation load and the current demand load is positive, and the ratio of the difference to the rated load of the power plant is not more than 10% or the difference between the current generation load and the current demand load is negative, it is the peak period. You can also compare the current time with the preset timetable separately. For example, the preset timetable is the peak period. If the current time is within the preset timetable, it is the peak period. If the current time is not within the preset timetable, it is The trough period; it is also possible to compare the current demand load of the current grid to the power plant and the current power generation load, and then compare the current time with the preset time schedule and combine the results of the two comparisons. According to the comparison results, the current time period is the peak period or the low period of power consumption.

Preferably, the control module 13 includes: a difference calculation unit 131 that calculates a current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculates the power generation load of the thermal power generation system and the power grid demand before the scheduled time. The historical load difference of the load, and calculating the total load difference between the current load difference and the historical load difference; the adjusting unit 132 performs the following operations according to the calculation result of the difference calculating unit 131: if the current load difference is When the total load difference of the historical load difference is a positive number, the accelerated electrolysis command is sent to the electrolysis water device 20, and if the total load difference between the current load difference and the historical load difference is negative, the slow electrolysis command is sent to the 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 peak valley power peak shaving method according to an embodiment of the present invention.

Step S101: Acquire a current demand load and/or a current time of the power grid;

Specifically, the current demand load of the power grid includes obtaining the current demand load of the current power grid to the power plant and the power generation 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 the preset time schedule;

Specifically, the current demand load of the current power grid to the power plant can be separately compared with the current power generation load; the current time can be compared with the preset time schedule separately; and the current demand load of the current power grid to the power plant and the current power generation load can also be used. For comparison, compare the current time with the preset timetable and combine the results of the two comparisons.

Step S103: determining, according to the comparison result, that the current time period is a peak period or a low period of power consumption;

Specifically, the current power generation load and the preset time schedule are preset, wherein the preset time period is a trough period. It is also possible to set a peak period within the preset schedule. In this embodiment, the peak period is preset in the preset schedule. When the current demand load of the current power grid to the power plant is compared with the current power generation load, if the difference between the current power generation load and the current demand load is a positive number, and the ratio of the difference to the power generation rated load of the power plant is greater than 10%, the power is low. Period, if the difference between the current power generation load and the current demand load is a positive number, and the ratio of the difference to the power generation rated load of the power plant is not more than 10% or the difference between the current power generation load and the current demand load is a negative number, it is a peak period. When the current time is compared with the preset timetable, if the current time is within the preset timetable, it is a peak period, and if the current time is not within the preset timetable, it is a low period. It is also possible to compare the current demand load of the current power grid with the current power generation load, compare the current time with the preset time schedule, and combine the results of the two comparisons to select a more optimized result.

Step S104: When the determination result is a trough period, the control module 13 sends the electrolysis device 20 Control commands are initiated to control the electrolysis water unit 20.

Specifically, step S104 further includes: step S1041: calculating a current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculating a historical load of the power generation load of the thermal power generation system and the demand load of the power grid before the reservation time. a difference; step S1042: if the total load difference between the current load difference and the historical load difference is a positive number, the accelerated electrolysis command is sent to the electrolysis device 20; and step S1043: if the total difference between the current load difference and the historical load is When the load difference is negative, the slow electrolysis command is sent to the electrolysis water device 20. That is, when it is judged to be a trough period, since the current grid requires less load on the power plant at the current stage of the trough, it is necessary to perform peak shaving. And a large amount of hydrogen and oxygen are stored for peak use. First, calculate the current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculate the historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before the scheduled time. Then calculate the total load difference between the current load difference and the historical load difference. If the total load difference between the current load difference and the historical load difference is a positive number, an accelerated electrolysis command is sent to the electrolysis water device 20; if the total load difference between the current load difference and the historical load difference is a negative number, the electrolysis is performed. The water device 20 sends a slowing electrolysis command. Accelerating the electrolysis command increases the electric power for controlling the electrolysis water device 20; slowing down the electrolysis command reduces the electric power for controlling the electrolysis water device 20.

Step S105: When the determination result is a peak period, the control module 13 sends a control command to the electrolysis water device 20 to control the electrolysis water device 20 to stop.

Specifically, when it is judged as the peak period, since the current demand of the current power grid to the power plant is high during the peak period, the power plant should generate power with maximum capacity for the user to use. And the stored large amount of hydrogen and oxygen are sent to the multi-fuel burner 7 of the thermal power system boiler for combustion.

The power peak shaving system and method thereof are provided by setting control device, electrolyzing water device and gas The body purification device achieves the effect of power peaking and frequency modulation. First, the control device obtains the current demand load and/or current time of the current power grid to the power plant, and controls the power consumption of the electrolysis water device to convert it into chemical energy according to the current demand load and/or current time of the current power grid to the power plant, and The hydrogen oxygen generated by the electrolyzed water is sent to a gas purifying device, and the gas purifying device performs dehydration and dehydration storage treatment on the hydrogen gas, and delivers the stored hydrogen oxygen to the multi-fuel burner of the thermal power generation system boiler for full combustion. It can realize the power peak-adjusting frequency modulation effect at any time in any time, and can also use electric energy to electrolyze water into hydrogen and oxygen, and then generate electricity by burning hydrogen and oxygen, thereby reducing carbon emissions.

The electrolyzed water device of the invention directly reduces the on-grid power of the thermal power generation system, provides the peak load for the whole year of the power grid, and indirectly utilizes the abandoned wind, abandoned light, abandoned water and abandoned nuclear power, thereby alleviating the problem of grid balance and peak-to-valley difference. Moreover, the hydrogen and part of the oxygen produced by the electrolysis water device can be sent to the pulverized coal boiler for combustion, and the low-load stable combustion of the large-scale thermal power generation system boiler can be realized, thereby increasing the load range of the low-load peak-shaving of the boiler, and adjusting the peak of the thermal power generation system. ability. The power consumption of the electrolyzed water device can be adjusted infinitely, that is, the power supply can be quickly changed from 50% load to 100% at any time, and the frequency modulation service of the power grid can be realized. The multi-fuel burner of the invention innovatively realizes that hydrogen and oxygen respectively enter the pulverized coal boiler of the power station for combustion and stable combustion, and the burner can be used for introducing other gaseous fuels such as biomass gas and natural gas into the pulverized coal boiler in the future. Combustion, thus realizing the flexibility of fuel in thermal power plants.

The above-described embodiments of the present invention are intended to be illustrative only and not to limit the invention. Therefore, any modifications, equivalent substitutions, improvements, etc., which are made without departing from the spirit and scope of the invention, are intended to be included within the scope of the invention. Rather, the scope of the appended claims is intended to cover all such modifications and modifications

Claims (10)

1. A power peak shaving system, comprising:

   a control device (10) for acquiring a current demand load and/or a current time of the power grid, and transmitting a control command to the electrolysis water device (20) according to the current demand load and/or the current time to control its power usage;

   An electrolysis water device (20) electrically connected to the thermal power generation system for electrolyzing water to generate gas according to the control command using the output power of the thermal power generation system;

   The gas purifying device (30) has an input end connected to the electrolysis water device (20), and an output end thereof communicates with the thermal power generation system.
2. The power peak shaving system according to claim 1, wherein

   The thermal power generation system includes: a multi-fuel burner (7);

   The multi-fuel burner (7) is in communication with an output end of the gas purifying device (30) for receiving a gas generated by the gas purifying device (30) and using the gas as a fuel or as a combustion aid Into the boiler.
3. The power peaking system according to claim 2, wherein the gas purifying device (30) comprises: a hydrogen purifying module (31) and an oxygen purifying module (32);

   The hydrogen purification module (31) has a hydrogen input end connected to the electrolysis water device (20), and a hydrogen output end thereof communicates with the multi-fuel burner;

   The oxygen purification module (32) has an oxygen output end connected to the electrolysis water device (20), and an oxygen output end thereof communicates with the multi-fuel burner.
4. The power peaking system of claim 1 further comprising:

   a chemical water treatment device (8) having an output end connected to the electrolysis water device (20) for The chemical water is treated as pure water, and the purified water is sent to the electrolyzed water device (20).
5. The power peak shaving system according to claim 1, wherein

   The control command includes: a start command, a stop command, and an electrolysis adjustment command, and the electrolysis adjustment command includes: accelerating the electrolysis command and slowing down the electrolysis command;

   The accelerated electrolysis instruction is for controlling the electrolysis water device (20) to increase electric power;

   The slowing electrolysis command is to control the electrolysis water device (20) to reduce electric power.
6. The power peak shaving system of claim 3, further comprising:

   A canning system (40) comprising a hydrogen canning system and an oxygen canning system coupled to an output of the hydrogen purification module (31), the oxygen canning system and an oxygen purification module (32) The outputs are connected to carry hydrogen and oxygen respectively output by the hydrogen purification module (31) and the oxygen purification module (32); or

   a pipeline transportation system (50) having one end connected to the output end of the hydrogen purification module (31) and the other end connected to the natural gas transmission pipeline for feeding hydrogen gas in the hydrogen purification module (31) to the natural gas transportation pipeline.
7. The power peak shaving system of claim 1 wherein said control device (10) comprises:

   Obtaining a module (11) for obtaining a current demand load and/or a current time of the power grid;

   The judging module (12) is configured to compare the current demand load and/or the current time of the power grid with the current power generation load and the preset time schedule, and determine that the current power consumption is a trough period or a peak period;

   The control module (13) performs the following operations according to the determination result of the judgment module (12):

   When the determination result is a trough period, the control module (13) sends a control command to the electrolysis water device (20) to control the activation of the electrolysis water device (20);

   When the determination result is a peak period, the control module (13) sends a control command to the electrolysis water device (20) to control the electrolysis water device (20) to stop.
8. The power peak shaving system of claim 1 wherein said 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 the reservation time And calculating the total load difference between the current load difference and the historical load difference;

   The adjusting unit (132) 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 a positive number, an accelerated electrolysis command is sent to the electrolysis water device (20); if the total load difference between the current load difference and the historical load difference is a negative number, The electrolyzed water device (20) sends a slowing electrolysis command.
9. A power peak shaving method, characterized by being applied to the power peak shaving system according to any one of claims 1-8, the method comprising:

   Step S101: Acquire a current demand load and/or a current time of the 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 the preset time schedule;

   Step S103: determining, according to the comparison result, that the current time period is a peak period or a low period of power consumption;

   Step S104: When the determination result is a trough period, the control module (13) sends a control command to the electrolysis water device (20) to control the electrolysis water device (20) to start;

   Step S105: When the determination result is a peak period, the control module (13) goes to the electrolysis water device (20) A control command is sent to control the electrolysis water device (20) to stop.
10. The power peak shaving method according to claim 9, wherein the sending of the control command by the control module (13) to the electrolysis water device (20) to control the activation of the electrolysis water device (20) further comprises:

    Step S1041: calculating a current load difference between the current power generation load of the thermal power generation system and the current demand load of the power grid, and calculating a historical load difference between the power generation load of the thermal power generation system and the demand load of the power grid before the reservation time;

    Step S1042: If the total load difference between the current load difference and the historical load difference is a positive number, the accelerated electrolysis command is sent to the electrolysis water device (20);

    Step S1043: If the total load difference between the current load difference and the historical load difference is a negative number, the slow electrolysis command is sent to the electrolysis water device (20).

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