CN111826669A - Large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability and control method - Google Patents
Large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability and control method Download PDFInfo
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 343
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 343
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 340
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 265
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 246
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003513 alkali Substances 0.000 claims abstract description 79
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000009826 distribution Methods 0.000 claims abstract description 43
- 238000000746 purification Methods 0.000 claims abstract description 25
- 230000004044 response Effects 0.000 claims abstract description 6
- 238000000926 separation method Methods 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 35
- 239000001301 oxygen Substances 0.000 claims description 35
- 229910052760 oxygen Inorganic materials 0.000 claims description 35
- 239000007789 gas Substances 0.000 claims description 33
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 239000013589 supplement Substances 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 239000000110 cooling liquid Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000008367 deionised water Substances 0.000 description 3
- 229910021641 deionized water Inorganic materials 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
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- 230000002708 enhancing effect Effects 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
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- 229910021529 ammonia Inorganic materials 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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- 238000006356 dehydrogenation reaction Methods 0.000 description 1
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- 238000004146 energy storage Methods 0.000 description 1
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- C25B1/00—Electrolytic production of inorganic compounds or non-metals
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability and a control method, wherein the system comprises: the water electrolysis hydrogen production module comprises: a plurality of the sensors are arranged to form a parallel form; a system power split controller: the power distribution and control device is configured to be used for power distribution and control of the water electrolysis hydrogen production module in the water electrolysis hydrogen production system; each water electrolysis hydrogen production module comprises a plurality of water electrolysis hydrogen production modules with different power levels and a module power shunt controller, the module power shunt controller is configured to be used for power shunt control of the water electrolysis hydrogen production modules in the module, the module power shunt controller is connected to the system power shunt controller, and the water electrolysis hydrogen production modules in the water electrolysis hydrogen production modules share a module manager used for temperature, alkali liquor circulation and gas-liquid separation control and a hydrogen purification assembly used for hydrogen purification. Compared with the prior art, the invention can improve the hydrogen production energy consumption efficiency and the wide power fluctuation adaptability, enhance the instantaneous response speed and reduce the power loading cost.
Description
Technical Field
The invention relates to a water electrolysis hydrogen production system, in particular to a large water electrolysis hydrogen production system with wide power fluctuation adaptability and a control method.
Background
Under the complex backgrounds of deep adjustment of world energy pattern, acceleration of actions for global coping with climate change and continuous strengthening of resource and environment constraints, hydrogen energy is considered to be one of the major strategic directions of world energy and power transformation, and is concerned by countries in the world. The source of hydrogen is an important issue for the development of hydrogen energy at present, and hydrogen is still used as an industrial raw material gas at present, so that the hydrogen has rich application in chemical industry, and from the source, three mature technical routes are mainly provided; firstly, hydrogen is produced by reforming fossil energy; secondly, hydrogen is produced as a by-product in industry; thirdly, electrolyzing water to produce hydrogen. The raw materials for hydrogen production by reforming fossil energy are mainly coal, so that the cost is low, the technology is mature, but the large-scale green hydrogen production of the technology is limited by the unavoidable emission of carbon dioxide and the use of fossil energy. The industrial by-product hydrogen mainly comes from industries such as coke, chlor-alkali, synthetic ammonia, propane dehydrogenation and the like, and can provide a low-cost hydrogen source for the early development of the hydrogen energy industry. The hydrogen production by water electrolysis is green and environment-friendly, flexible in production and high in purity, and if the hydrogen production is matched with renewable energy sources for power generation and large-scale utilization of waste electricity, the cost can be remarkably reduced, and the method has extremely high commercialization potential and is the most promising method for preparing hydrogen energy. In the process of hydrogen production by water electrolysis, the most mature technical route at present is an alkaline water electrolysis technology.
Through the literature search of the prior art, the research of the current large-scale electrolytic water system mostly focuses on the development and optimization of the electrolytic water equipment so as to realize the purposes of integration of the electrolytic water equipment, cost reduction, purification of product gas and the like, such as:
chinese patent CN 104911626A: the device is simple in structure and convenient to install, greatly reduces the cost of the rubber mat by using the ethylene propylene diene rubber mat, can be used repeatedly, not only can directly convey high-pressure hydrogen and oxygen under a high-pressure state, reduces the link of gas pressurization, and further reduces the cost.
Chinese patent CN 1920100: the method for continuously purifying the water electrolysis hydrogen provides a method for continuously purifying the water electrolysis hydrogen by periodically and continuously drying by using a 3-drying tower, not only can continuously obtain high-purity product hydrogen, but also can realize no waste of the hydrogen, greatly improves the economic benefit and is beneficial to protecting the atmospheric environment.
Chinese patent CN 205442733U: the modular electrolysis device is provided with a base, an electrolysis device and an upper cover, and the water electrolysis device is modularized and can be suitable for different water treatment devices.
Chinese patent CN 106148989A: the electric energy storage system comprises a power supply system, a water electrolysis device and a gas storage device, and the method for generating hydrogen and oxygen is characterized in that residual electric energy is used for generating hydrogen and oxygen through the water electrolysis device, and storing the electric energy.
Chinese patent CN 1041130084A: the method for controlling the wind power-hydrogen production grid-connected power generation system provides a wind turbine generator model based on a double-fed induction generator, establishes an electrolyzed water hydrogen production equipment model and controls the grid-connected power generation system.
Although the existing related researches mention that a plurality of water electrolysis hydrogen production devices are used in the same system, the modular integration of a single water electrolysis device is not considered, the wide power fluctuation adaptability system framework of large-scale water electrolysis hydrogen production is lacked, and the optimization method of the wide power fluctuation adaptability of the large-scale water electrolysis hydrogen production system is lacked.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability and a control method.
The purpose of the invention can be realized by the following technical scheme:
a large scale water electrolysis hydrogen production system with wide power fluctuation adaptability, the system comprising:
the water electrolysis hydrogen production module comprises: a plurality of the sensors are arranged to form a parallel form;
a system power split controller: the power distribution and control device is configured to be used for power distribution and control of the water electrolysis hydrogen production module in the water electrolysis hydrogen production system;
each water electrolysis hydrogen production module comprises a plurality of water electrolysis hydrogen production modules with different power grades and a module power shunt controller, the module power shunt controller is configured to be used for power shunt control of the water electrolysis hydrogen production modules in the module, the module power shunt controller is connected to the system power shunt controller, and the water electrolysis hydrogen production modules in the water electrolysis hydrogen production modules share a module manager for temperature, alkali liquor circulation and gas-liquid separation control and a hydrogen purification assembly for hydrogen purification.
The electrolytic water hydrogen production modules with different power levels in the electrolytic water hydrogen production module are respectively provided with a plurality of electrolytic tanks which operate independently, and the electrolytic tanks are connected to a module manager and a hydrogen purification assembly which are shared in the electrolytic water hydrogen production module.
The module manager comprises a rectifier transformer, an oxygen side gas diaphragm valve, an oxygen side gas-liquid separator, a hydrogen side gas diaphragm valve, a hydrogen side gas-liquid separator, an alkali liquid tank, an alkali supplement pump, an alkali liquid filter and an alkali supplement branch, wherein each electrolyzed water hydrogen production module in the same electrolyzed water hydrogen production module is respectively connected to a module power split controller through one rectifier transformer, oxygen output ports of each electrolyzed water hydrogen production module are mutually communicated and connected to the oxygen side gas-liquid separator, a gas output port of the oxygen side gas-liquid separator discharges oxygen through the oxygen side gas diaphragm valve, hydrogen output ports of each electrolyzed water hydrogen production module are mutually communicated and connected to the hydrogen side gas-liquid separator, a gas output port of the hydrogen side gas-liquid separator is connected to the hydrogen purification assembly through the hydrogen side gas diaphragm valve, and alkali liquid output ports of the oxygen side gas-liquid separator and the hydrogen side gas-liquid separator are communicated to one, the input end of the alkali liquor filter is also connected with the alkali liquor tank through the alkali supplementing pump, and the alkali liquor inlets of the electrolyzed water hydrogen production modules are respectively connected with the output end of the alkali liquor filter through an alkali supplementing branch.
The alkali supplementing branch comprises an alkali liquor circulating pump and an alkali liquor cooler which are connected in series, the input end of the alkali liquor circulating pump is connected with the output end of the alkali liquor filter, and the output end of the alkali liquor cooler is connected with the alkali liquor inlet of the corresponding water electrolysis hydrogen production module.
The gas output ends of the hydrogen purification components of all the water electrolysis hydrogen production modules of the system are communicated to form a hydrogen output port of the system.
The communication between the hydrogen output ports of the hydrogen purification assembly is in a form of comprising: bus, star, ring, tree, and mesh.
The system power shunt controller and the module power shunt controller both comprise microprocessor chips.
A control method of a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability is used for controlling the large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability, and comprises the following steps:
(S1) predicting the distribution power that the grid can provide;
(S2) the system power distribution controller determines the number of the water electrolysis hydrogen production modules to be started and the distribution power of each water electrolysis hydrogen production module according to the running state of each water electrolysis hydrogen production module;
(S3) the module power distribution controller distributes the distributed power of the electrolyzed water hydrogen production modules and starts the electrolyzed water hydrogen production modules to work based on the distributed power of the corresponding electrolyzed water hydrogen production modules and the working states of the electrolyzed water hydrogen production modules in the electrolyzed water hydrogen production modules.
Step (S2) module power distribution is carried out according to the average service life requirement of the water electrolysis hydrogen production module and the fluctuation condition of the distribution power, and the specific steps are as follows: for short-time power distribution fluctuation, intermittently starting each water electrolysis hydrogen production module to ensure that all the water electrolysis hydrogen production modules are in a working temperature range; for long-time power distribution power fluctuation, the water electrolysis hydrogen production module needing to be started is preheated in advance, and the response speed of the system is increased.
And (S3) uniformly distributing the working time of the water electrolysis hydrogen production equipment according to the accumulated working time of the water electrolysis hydrogen production modules in the water electrolysis hydrogen production modules, and determining the distribution power of the water electrolysis hydrogen production modules in the modules according to the distribution power of the corresponding water electrolysis hydrogen production modules.
Compared with the prior art, the invention has the following advantages:
(1) the invention adopts a system architecture which flexibly matches water electrolysis hydrogen production modules with different power levels, and is beneficial to ensuring that each water electrolysis hydrogen production device is positioned near the optimal working point under the condition of wide power fluctuation, thereby improving the hydrogen production energy consumption efficiency of large-scale water electrolysis under each input working condition and greatly improving the wide power fluctuation adaptability of the water electrolysis hydrogen production system.
(2) The invention adopts the system logic of flexibly starting any number of water electrolysis hydrogen production modules, and ensures that part of water electrolysis hydrogen production equipment in the system is always in a working state, thereby being capable of responding to different power supply requirements more quickly, increasing or reducing the hydrogen production power quickly, and enhancing the adaptability and the response speed of the system.
(3) The invention adopts the independent water electrolysis hydrogen production modules, so that each module is in a working power interval during working, thereby ensuring the normal work of each auxiliary device, balancing the pressure of the cathode and the anode, improving the purity of hydrogen and oxygen of products and improving the safety of a water electrolysis hydrogen production system.
(4) The invention adopts a system scheme that the same water electrolysis hydrogen production module shares the module manager, ensures that different water electrolysis hydrogen production modules in the same water electrolysis hydrogen production module are managed by the same module manager, and can maintain the temperature of all the water electrolysis hydrogen production modules under the same water electrolysis hydrogen production module near the working temperature, thereby ensuring that the electrolysis modules can be quickly loaded, enhancing the instantaneous response speed of the water electrolysis hydrogen production system and reducing the power loading cost.
(5) The invention adopts the arrangement mode of the gas purification components in the modules, and the gas purification components among the modules can adopt bus type, star type, ring type, tree type, net type and other connection topological structures, thereby improving the purity of output hydrogen under the condition of wide power fluctuation, the safety of operation and the utilization rate of a system, simultaneously providing the online self-generating capacity of the rate purification module and avoiding the shutdown caused by the regeneration process;
(6) the invention adopts the arrangement of the modularized water electrolysis system, thereby being beneficial to the serial production of the water electrolysis hydrogen production equipment, reducing the production cost, reducing the maintenance difficulty when the system fails and reducing the failure maintenance cost of the water electrolysis hydrogen production equipment.
Drawings
FIG. 1 is a schematic diagram of the structure of a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability of the invention;
FIG. 2 is a schematic topology diagram of a large scale electrolytic water hydrogen production system with wide power fluctuation adaptability of the present invention;
FIG. 3 is a schematic diagram of the structure of a module manager in a large-scale electrolytic water hydrogen production system with wide power fluctuation adaptability of the present invention;
FIG. 4 is a block flow diagram of a control method for a large scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to the present invention;
FIG. 5 is a diagram illustrating power distribution fluctuation in an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the temperature change of the electrolyzed water hydrogen production module after the operation is stopped in the embodiment of the invention;
FIG. 7 shows the operation power of the No. 1 hydrogen production module by water electrolysis and the power level modules in the power fluctuation in the embodiment of the present invention;
FIG. 8 is a graph showing the operation power of the electrolytic water hydrogen production module 2 and the power level modules in the power fluctuation according to the embodiment of the present invention;
FIG. 9 shows the operation power of the 3 rd hydrogen production module by water electrolysis and the power level modules in the power fluctuation according to the embodiment of the present invention;
FIG. 10 shows the operating power of the hydrogen production module from electrolyzed water and the power class modules in the embodiment of the invention in the power fluctuation;
FIG. 11 shows the operation power of the No. 5 electrolytic water hydrogen production module and each power class module in the power fluctuation according to the embodiment of the present invention.
In the figure, 1 is a system power split controller, 2 is an electrolyzed water hydrogen production module, 3 is a module manager, 4 is a module power split controller, 5 is an I-type electrolyzed water hydrogen production module, 6 is a j-type electrolyzed water hydrogen production module, 7 is a hydrogen purification assembly, 31 is an oxygen side gas diaphragm valve, 32 is a hydrogen side gas diaphragm valve, 33 is an oxygen side gas-liquid separator, 34 is a hydrogen side gas-liquid separator, 35 is an electrolyzed water hydrogen production module, 36 is a rectifier transformer, 37 is an alkali liquor cooler, 38 is an alkali liquor tank, 39 is an alkali supplement pump, 310 is an alkali liquor filter, and 311 is an alkali liquor circulating pump.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
As shown in fig. 1 and fig. 2, a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability comprises:
and (3) electrolyzing water to prepare the hydrogen module 2: a plurality of the sensors are arranged to form a parallel form;
system power split controller 1: the power distribution and control device is configured to be used for the power distribution and control of the water electrolysis hydrogen production module 2 in the water electrolysis hydrogen production system;
each water electrolysis hydrogen production module 2 comprises a plurality of water electrolysis hydrogen production modules with different power levels and a module power shunt controller 4, the module power shunt controller 4 is configured to be used for power shunt control of the water electrolysis hydrogen production modules in the module, the module power shunt controller 4 is connected to the system power shunt controller 1, and the water electrolysis hydrogen production modules in each water electrolysis hydrogen production module 2 share a module manager 3 for temperature, alkali liquor circulation and gas-liquid separation control and a hydrogen purification assembly 7 for hydrogen purification. In the embodiment, n water electrolysis hydrogen production modules 2 are arranged, and the ith water electrolysis hydrogen production module 2 comprises m water electrolysis hydrogen production equipment modules with power levels, wherein the rated power is PMi1The I type electrolyzed water hydrogen production module 5 of MW is provided with Xi1Rated power of PMi2Model X of MW II type water electrolysis hydrogen production equipmenti2In this way, the rated power is PMijThe MW j-type water electrolysis hydrogen production equipment module 6 is provided with XijAnd (4) respectively. Obviously, the water electrolysis hydrogen production system of the invention has the rated power of P and the unit of MW, and comprises:
for any ith power level electrolytic water hydrogen production module in the above-mentioned ith electrolytic water hydrogen production module 2, due to technical limitation, the lowest power of operation is PMij_minAnd therefore its power p at any instant, in MW, i.e.:
PMij_min≤p≤PMij，
for any water electrolysis hydrogen production equipment, the working temperature of the equipment should be at the minimum working temperature tLFrom DEG C to a maximum temperature tHBetween the temperature and the temperature, when the temperature is too low or too high, the water electrolysis hydrogen production equipment cannot work normally, so the temperature t of any water electrolysis hydrogen production equipment is measured in units of ℃, when the water electrolysis hydrogen production equipment works or needs to enter a working state, the following should be provided:
tL≤t≤tH，
and when the input power of the water electrolysis hydrogen production equipment which normally works is reduced to zero, the cooling system in the auxiliary equipment stops working, the temperature starts to slowly reduce, referring to fig. 5, after cooling lasts for a certain time, the temperature of the hydrogen production equipment is lower than the lowest working temperature, at the moment, the input power is increased, and the water electrolysis hydrogen production module cannot normally work. Therefore, in order to ensure the wide power fluctuation adaptability of the water electrolysis hydrogen production system, each water electrolysis hydrogen production module in each module needs to be kept within the working temperature range through intermittent work and module internal thermal management.
Assuming that the single water electrolysis hydrogen production equipment with the same or similar technical level has the rated power of P MW and the minimum working power of Psingle_minMW, because the technical level is equivalent to any water electrolysis hydrogen production equipment module in the invention, and the rated power is far larger than that of a single water electrolysis hydrogen production equipment module, the minimum power of MW is certainly larger than the minimum power P of any single water electrolysis hydrogen production equipment moduleMij_minMW, i.e.:
PMij_min＜Psingle_min，
therefore, compared with the working power interval [ P ] of a system formed by adopting single water electrolysis hydrogen production equipmentsingle_min,P]The large-scale water electrolysis hydrogen production system can use any number of water electrolysis modules and any number of water electrolysis modules in the modules, wherein the minimum working power is MIN (P)Mij_min) MW, working range [ MIN (P) ]Mij_min),P]Therefore, the minimum working power of the large-scale water electrolysis hydrogen production system is smaller, namely:
MIN(PMij_min)＜PMij_min，
therefore, the large-scale water electrolysis hydrogen production system can obviously improve the wide power fluctuation adaptability.
The electrolyzed water hydrogen production modules with different power levels in the electrolyzed water hydrogen production module 2 are respectively provided with a plurality of electrolytic tanks which run independently, and the electrolytic tanks are connected to a module manager 3 and a hydrogen purification component 7 which are shared in the electrolyzed water hydrogen production module 2.
As shown in fig. 3, a module manager rectifier transformer 36, an oxygen side gas diaphragm valve 31, an oxygen side gas-liquid separator 33, a hydrogen side gas diaphragm valve 32, a hydrogen side gas-liquid separator 34, an alkaline liquid tank 38, an alkaline make-up pump 39, an alkaline liquid filter 310 and an alkaline make-up branch, wherein each electrolyzed water hydrogen production module 35 in the same electrolyzed water hydrogen production module is respectively connected to the module power split controller 4 through a rectifier transformer 36, oxygen output ports of each electrolyzed water hydrogen production module 35 are mutually communicated and connected to the oxygen side gas-liquid separator 33, a gas output port of the oxygen side gas-liquid separator 33 discharges oxygen through the oxygen side gas diaphragm valve 32, hydrogen output ports of each electrolyzed water hydrogen production module 35 are mutually communicated and connected to the hydrogen side gas-liquid separator 34, a gas output port of the hydrogen side gas-liquid separator 34 is connected to the hydrogen purification assembly 7 through the hydrogen side gas diaphragm valve 32, the alkali liquor outlets of the oxygen side gas-liquid separator 33 and the hydrogen side gas-liquid separator 34 are communicated to an alkali liquor filter 310, the input end of the alkali liquor filter 310 is also connected with an alkali liquor tank 38 through an alkali supplementing pump 39, and the alkali liquor inlets of the electrolyzed water hydrogen production modules 35 are respectively connected with the output end of the alkali liquor filter 310 through an alkali supplementing branch. The alkali supplementing branch comprises an alkali liquor circulating pump 311 and an alkali liquor cooler 37 which are connected in series, the input end of the alkali liquor circulating pump 311 is connected with the output end of the alkali liquor filter 310, and the output end of the alkali liquor cooler 37 is connected with the corresponding alkali liquor inlet of the water electrolysis hydrogen production module 35.
During the working process, the alkali liquor respectively flows out from the outlets of the hydrogen side and the oxygen side of the water electrolysis hydrogen production module 35 with various power levels, respectively enters the hydrogen side gas-liquid separator 34 and the oxygen side gas-liquid separator 33, gas and the alkali liquor are separated in the hydrogen side gas-liquid separator 34 and the oxygen side gas-liquid separator 33, and the pressure is adjusted by the hydrogen side gas diaphragm valve 32 and the oxygen side gas diaphragm valve 31. The alkali liquor flows out from the hydrogen side gas-liquid separator 34 and the oxygen side gas-liquid separator 33, enters the alkali liquor filter 310, is filtered to remove impurities which may appear, enters each alkali liquor cooler 37 to be cooled under the action of the alkali liquor circulating pump 311 of each power grade electrolyzed water hydrogen production module, and finally enters each power grade electrolyzed water hydrogen production module 35, and the alkali liquor flow of each module is controlled by the alkali liquor circulating pump 311. The thermal management of the electrolyzed water hydrogen production module 35 with each power level is mainly realized by a gas-liquid separator and an alkali liquor cooler 37, wherein the alkali liquor cooler 37 can accurately control the temperature of the alkali liquor at the outlet of the alkali liquor cooler 37. In the gas-liquid separator, the alkali liquor is continuously sprayed by normal-temperature deionized water in the device, so that the contained gas is removed, and the temperature is reduced, so that components such as a deionized water tank, a deionized water pump and the like are required, and the alkali liquor is contained in the gas-liquid separator. Before entering the electrolytic water hydrogen production module 35, the alkali liquor is heat exchanged with the cooling liquid in the alkali liquor cooler 37, so as to reduce the temperature, and a cooling water tower and a cooling liquid pump are needed to control the temperature and the flow of the cooling liquid, and the cooling liquid is contained in the alkali liquor cooler 37.
The gas output ends of the hydrogen purification components 7 of all the water electrolysis hydrogen production modules 2 of the system are communicated to form a hydrogen output port of the system. The communication between the hydrogen outlets of the hydrogen purification assembly 7 is in the form of: bus, star, ring, tree, and mesh.
Both the system power shunt controller 1 and the module power shunt controller 4 include microprocessor chips.
As shown in fig. 4, a method for controlling a large-scale hydrogen production system by water electrolysis with wide power fluctuation adaptability is used for controlling the large-scale hydrogen production system by water electrolysis with wide power fluctuation adaptability, and the method comprises the following steps:
(S1) providing electric energy and current input electric energy according to the history of the power supply system, analyzing power impact possibly encountered by the system by combining the power distribution requirement of a power grid, and calculating the redundant power required at the current moment;
(S2) providing electric energy and current input electric energy according to the history of the power supply system, combining ideal power intervals of various types of water electrolysis hydrogen production equipment in the water electrolysis hydrogen production system, and considering the required redundant power, calculating the number of water electrolysis hydrogen production modules 2 required to be started currently, the distribution power of each module, and the number of water electrolysis hydrogen production equipment required to be started in each starting module;
(S3) the power supply condition of the power grid in the future Z hours is estimated, the future operation condition of the system is predicted, and the power distribution power is determined;
(S4) according to the temperature of each water electrolysis hydrogen production device in each working module, combining with the prediction of future working conditions, distributing power to each water electrolysis hydrogen production device in each starting module, and ensuring that the water electrolysis hydrogen production devices operate in an ideal region or a working region;
(S5) according to the accumulated working time of each water electrolysis hydrogen production device, the working time of the water electrolysis hydrogen production device is uniformly distributed, and the service life of each individual water electrolysis hydrogen production device is prevented from being consumed too fast;
(S6) intermittently starting each hydrogen production module according to the average service life requirement and the predicted working condition and short-time power distribution power fluctuation, and ensuring that all the modules are in the working temperature range; for longer distribution power fluctuation, after the standby module is cooled, the water electrolysis hydrogen production equipment needing to be started can be preheated in advance through the heat management system, and the response speed of the system is increased.
This embodiment sets up a large-scale electrolytic water hydrogen production system with wide power fluctuation adaptability, and the rated power of system is 100MW, and 5 electrolytic water hydrogen production modules 2 are established to the branch under the system, and the rated power of every module is 20MW, and every module is by 2 rated power for 2MW, 2 rated power for 3MW and 2 rated power for 5MW electrolytic water hydrogen production module component. For the water electrolysis hydrogen production module in each module, the working interval of the 2MW water electrolysis hydrogen production module is 0.8MW-2 MW; the working interval of the 3MW water electrolysis hydrogen production module is 1.2MW-3 MW; the working interval of the 5MW water electrolysis hydrogen production module is 2 MW-5M. The working temperature of each water electrolysis hydrogen production module is 60-95 ℃, when the temperature of the water electrolysis hydrogen production module is lower than 60 ℃, the water electrolysis hydrogen production module cannot work normally, and referring to fig. 6, after the water electrolysis hydrogen production module stops working for 4 hours, the temperature of the water electrolysis hydrogen production module is reduced to below 60 ℃, and the module cannot work normally.
For the single water electrolysis hydrogen production module with the same technical level, if the rated power of the single water electrolysis hydrogen production module is also 100MW, the working interval is 40-100MW, and the power fluctuation adaptive range is 40% -100% of the rated value; for the water electrolysis hydrogen production system, the minimum working power is 1MW, and the power fluctuation adaptive range is 0.8% -100% of the rated value, so that the power fluctuation adaptability of the water electrolysis hydrogen production system is obviously improved.
Referring to fig. 5, before the time t is 0(h), the power supply power of the power grid to the water electrolysis hydrogen production system is stabilized at 100MW, the water electrolysis hydrogen production system and each hydrogen production module are in the rated working state, referring to fig. 7 to 11, each type of water electrolysis hydrogen production module is in the rated working state, and the temperature is maintained at 90 ℃.
Referring to fig. 5, starting at time t-0 (h), the power supply of the power grid fluctuates, and the distribution power of the system for producing hydrogen by electrolyzing water is reduced to 20MW and is kept for 12 hours. At this time, if a single water electrolysis hydrogen production module with the same technical level is adopted, the water electrolysis hydrogen production module cannot work normally under the input power of 20 MW. The system for producing hydrogen by electrolyzing water can adjust each module for producing hydrogen by electrolyzing water to work intermittently, ensure that the temperature of each module and each module is not reduced below the working temperature while ensuring that the distributed power of each module for producing hydrogen by electrolyzing water is in the working interval in each work, and ensure that the further power supply fluctuation of a power grid can be responded quickly.
Referring to fig. 7 to 11, in the water electrolysis hydrogen production system, 10MW of power may be intermittently allocated to each hydrogen production module, the allocated power of the standby hydrogen production module is 0MW, and the cooling module is in an off state. And the hydrogen production modules are subjected to power distribution regulation and control, so that the standby time of each module is not more than 4 hours. Meanwhile, in the work of each module, 2.5MW power is distributed to the 5MW electrolyzed water hydrogen production module in the module, 1.5MW power is distributed to the 3MW electrolyzed water hydrogen production module, and 1MW power is distributed to the 2MW electrolyzed water hydrogen production module.
Referring to table 1 and fig. 7 to 11, when t is 1(h), the hydrogen production modules 1 and 3 are respectively in an operating state, the power is 10MW, and the hydrogen production modules 2, 4 and 5 are in a standby state; when t is 2(h), keeping 1 and 4 hydrogen production modules in a working state, and keeping 2, 3 and 5 hydrogen production modules in a standby state; when t is 3(h), the hydrogen production modules 1, 3 and 4 are in a standby state, and the hydrogen production modules 2 and 5 are adjusted to be in a working state; when t is 4(h), adjusting the hydrogen production modules 2 and 3 to 10MW, and adjusting the hydrogen production modules 1, 4 and 5 to a standby state; when t is 5(h), the hydrogen production modules 1, 2 and 3 are in a standby state, the hydrogen production modules 4 and 5 are in a working state, and the power is 10 MW; when t is 6(h), the hydrogen production modules 1 and 2 are adjusted to be in a working state, and the hydrogen production modules 3, 4 and 5 enter a standby state; when t is 7(h), the 1 and 3 hydrogen production modules are in a 10MW working state, and the 2, 4 and 5 hydrogen production modules are in a standby state; when t is 8(h), 2, 4 and 5 hydrogen production modules are in a working state, and 1, 3 and 5 hydrogen production modules are in a standby state; when t is 9(h), the hydrogen production modules 1, 2 and 4 are in a standby state, and the hydrogen production modules 3 and 5 are in a working state; when t is 10(h), the input power of the 2, 4 hydrogen production modules is 10MWW, and the 1, 3, 5 hydrogen production modules are in a standby state; when t is 11(h), the hydrogen production modules 1 and 3 are in a working state, and the hydrogen production modules 2, 4 and 5 are in a standby state; when t is 12(h), the hydrogen production modules 1 and 2 are in an operating state, and the hydrogen production modules 3, 4 and 5 are in a standby state.
When t 13(h), the electric wire netting distribution resumes to 100MW, and the hydrogen manufacturing module that electrolytic water hydrogen manufacturing system started because can adjust in a flexible way, the temperature of each hydrogen manufacturing module all is in operating temperature in each module, and the distribution that can quick corresponding electric wire netting increases, can work to rated state rapidly.
TABLE 1 Power distribution Power fluctuation of the grid and Power distribution of the Water-Electrolysis Hydrogen production modules
Through the adjustment, the water electrolysis hydrogen production system can respond to power fluctuation in a wide range, meanwhile, each water electrolysis hydrogen production module is ensured to work in an ideal working interval, and the overall efficiency is improved.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (10)
1. A large scale water electrolysis hydrogen production system with wide power fluctuation adaptability is characterized in that the system comprises:
electrolytic water hydrogen production module (2): a plurality of the sensors are arranged to form a parallel form;
system power split controller (1): is configured to be used for power distribution and control of the water electrolysis hydrogen production module (2) in the water electrolysis hydrogen production system;
each water electrolysis hydrogen production module (2) comprises a plurality of water electrolysis hydrogen production modules (35) with different power levels and a module power distribution controller (4), the module power distribution controller (4) is configured to be used for power distribution control of the water electrolysis hydrogen production modules (35) in the module, the module power distribution controller (4) is connected to the system power distribution controller (1), and the water electrolysis hydrogen production modules (35) in each water electrolysis hydrogen production module (2) share a module manager (3) for temperature, alkali liquor circulation and gas-liquid separation control and a hydrogen purification assembly (7) for hydrogen purification.
2. The large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 1, characterized in that the water electrolysis hydrogen production modules (35) with different power levels in the water electrolysis hydrogen production module (2) are respectively provided with a plurality of electrolytic tanks which are operated independently, and the electrolytic tanks are connected to the module manager (3) and the hydrogen purification assembly (7) shared in the water electrolysis hydrogen production module (2).
3. The large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 1, characterized in that the module manager (3) comprises a rectifier transformer (36), an oxygen side gas diaphragm valve (31), an oxygen side gas-liquid separator (33), a hydrogen side gas diaphragm valve (32), a hydrogen side gas-liquid separator (34), an alkali liquid tank (38), an alkali supplement pump (39), an alkali liquid filter (310) and an alkali supplement branch, each water electrolysis hydrogen production module (35) in the same water electrolysis hydrogen production module (2) is respectively connected to the module power split controller (4) through one rectifier transformer (36), oxygen output ports of each water electrolysis hydrogen production module (35) are mutually communicated and connected to the oxygen side gas-liquid separator (33), and a gas output port of the oxygen side gas-liquid separator (33) discharges oxygen through the oxygen side gas diaphragm valve (31), the hydrogen outlets of the electrolyzed water hydrogen production modules (35) are communicated with each other and connected to a hydrogen side gas-liquid separator (34), the gas outlet of the hydrogen side gas-liquid separator (34) is connected to a hydrogen purification component (7) through a hydrogen side gas diaphragm valve (32), the alkali liquor outlets of the oxygen side gas-liquid separator (33) and the hydrogen side gas-liquid separator (34) are communicated to an alkali liquor filter (310), the input end of the alkali liquor filter (310) is also connected with the alkali liquor tank (38) through an alkali supplementing pump (39), and the alkali liquor inlets of the electrolyzed water hydrogen production modules (35) are respectively connected with the output end of the alkali liquor filter (310) through an alkali supplementing branch.
4. The large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 3, wherein the alkali supplement branch comprises an alkali liquor circulating pump (311) and an alkali liquor cooler (37) which are connected in series, the input end of the alkali liquor circulating pump (311) is connected with the output end of the alkali liquor filter (310), and the output end of the alkali liquor cooler (37) is connected with the alkali liquor inlet of the corresponding water electrolysis hydrogen production module (35).
5. The large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 1, characterized in that the gas output ends of the hydrogen purification components (7) of all the water electrolysis hydrogen production modules (2) of the system are communicated to form a hydrogen output port of the system.
6. A large scale electrolytic water hydrogen production system with wide power fluctuation adaptability according to claim 5, characterized in that the communication between the hydrogen output ports of the hydrogen purification component (7) is in the form of: bus, star, ring, tree, and mesh.
7. The large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 1, wherein the system power split controller (1) and the module power split controller (4) both comprise microprocessor chips.
8. A control method of a large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability is characterized in that the method is used for controlling the large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to any one of claims 1-7, and the method comprises the following steps:
(S1) predicting the distribution power that the grid can provide;
(S2) the system power distribution controller determines the number of the water electrolysis hydrogen production modules (2) to be started and the distributed power of each water electrolysis hydrogen production module (2) according to the running state of each water electrolysis hydrogen production module (2);
(S3) the module power distribution controller (4) distributes the distributed power of the electrolyzed water hydrogen production modules (35) and starts the electrolyzed water hydrogen production modules (35) to work based on the distributed power of the corresponding electrolyzed water hydrogen production modules (2) and the working states of the electrolyzed water hydrogen production modules (35) in the electrolyzed water hydrogen production modules (2).
9. The control method of the large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 8, wherein the step (S2) is to perform module power distribution according to the average life requirement and the distribution power fluctuation condition of the water electrolysis hydrogen production module (2), and specifically comprises the following steps: for short-time power distribution fluctuation, intermittently starting each water electrolysis hydrogen production module (2) to ensure that all the water electrolysis hydrogen production modules (2) are in a working temperature range; for long-time power distribution power fluctuation, the water electrolysis hydrogen production module (2) needing to be started is preheated in advance, and the response speed of the system is increased.
10. The control method of the large-scale water electrolysis hydrogen production system with wide power fluctuation adaptability according to claim 8, characterized in that the step (S3) is to uniformly distribute the working time of the water electrolysis hydrogen production equipment according to the accumulated working time of the water electrolysis hydrogen production modules (35) in the water electrolysis hydrogen production module (2), and determine the distribution power of the water electrolysis hydrogen production modules (35) in the module according to the distribution power of the corresponding water electrolysis hydrogen production module (2).
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