CN114186438A - Method for establishing proton exchange membrane electrolytic cell performance prediction model for hydrogen production - Google Patents
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Abstract
The invention discloses a method for establishing a proton exchange membrane electrolytic cell performance prediction model for hydrogen production, which realizes the prediction of input voltage required by an electrolytic cell under different operating conditions. The method for establishing the performance prediction model of the constructed proton exchange membrane electrolytic cell for hydrogen production comprises 5 parts: solving the required input voltage of the electrolytic cell, solving the activation overpotential of the anode and the cathode, solving the mass transfer overpotential, solving the ohm overpotential and calculating the mass transfer of the two-phase flow. The modeling method provided by the invention accurately describes the electrochemical reaction mechanism and the internal mass transfer characteristic of the proton exchange membrane electrolytic cell, and simultaneously considers the two-phase transmission characteristic in the electrolytic cell. The method has high practical significance and accuracy for predicting the performance of the proton exchange membrane electrolytic cell. The input parameters of the model cover various operating condition parameters and battery material design parameters in the operation of the electrolytic cell, and the influence of the core parameters on the performance of the electrolytic cell can be effectively predicted.
Description
Technical Field
The invention belongs to the field of electrochemical hydrogen production, and particularly relates to a calculation method for predicting the performance of an electrolytic cell.
Background
The hydrogen is an energy medium which is clean, renewable and widely available, and the development and the utilization of the hydrogen energy have very important significance for reducing the emission of greenhouse gases, realizing carbon peak reaching, realizing energy diversification and ensuring energy safety. The hydrogen is prepared by electrolyzing water, and can be combined with various renewable energy sources.
The hydrogen production by utilizing the proton exchange membrane electrolytic cell has the advantages of high hydrogen purity, low gas transmembrane rate, suitability for high current density operation and the like. However, the proton exchange membrane electrolytic cell also has the problems of high cost, insufficient performance (efficiency) and the like, and a complex two-phase (reactant liquid water and resultant hydrogen and oxygen) flow process exists inside the proton exchange membrane electrolytic cell, which directly affects the performance (required input voltage) of the proton exchange membrane electrolytic cell. Through reasonable design of operation conditions and optimization of key parameters of the electrolytic cell, the method is very important for improving the performance of the electrolytic cell and reducing energy consumption. The simulation modeling is a key technology which can effectively predict and optimize the performance of the electrolytic cell at lower economic cost. The method for establishing the proton exchange membrane electrolytic cell performance prediction model is mainly applied to the design and development stages of electrolytic cells and provides a method for the optimal design of predicting the electrolytic cell performance.
Disclosure of Invention
The invention aims to provide a method for establishing a proton exchange membrane electrolytic cell performance prediction model for hydrogen production, which can realize the prediction of input voltage required by an electrolytic cell under different operating conditions.
The method for establishing the performance prediction model of the constructed proton exchange membrane electrolytic cell for hydrogen production comprises 5 parts: solving the required input voltage of the electrolytic cell, solving the activation overpotential of the anode and the cathode, solving the mass transfer overpotential, solving the ohm overpotential and calculating the mass transfer of the two-phase flow. The method comprises the following specific steps:
(1) solving for the required input voltage of the cell
V=Voc+Vact_a+Vact_c+Vcon_a+Vcon_c+Vohm 1-1
Wherein a reversible voltage VocThe calculation formula of (A) is as follows:
(2) solving for the activation overpotentials of the anode and cathode
(3) Solving mass transfer overpotentials for anode and cathode
(4) Solving for ohmic overpotentials
(5) Two-phase flow mass transfer calculation
The step comprises the step (3) abovesg,cl,cAnd solving λ in step (4), specifically comprising: (5.1) parameters to be calculated in the anode flow channel:
Jlq,inAin-(Jlq,reac+Jlq,cro)Aact=uout,aclqAinslq,out,a 5-1
(5.2) parameters to be calculated in the cathode flow channel:
Jlq,croAact=uout,cclqAinslq,out,c-Nvp,out,c 5-9
Nvp,out,c=uout,ccvpAinsg,out,c 5-11
slq,out,c+sg,out,c=1 5-12
(5.3) parameters to be calculated in the anode and cathode porous electrodes:
the relationship between hydraulic pressure and liquid water saturation is described by the Leverett equation in the porous electrode, i.e. plq,ch,a、plq,cl,a、plq,ch,c、plq,cl,cCorresponding solution slq,ch,a、slq,cl,a、slq,ch,c、slq,cl,c. At the same timeAnd slq,cl,a、sg,cl,cAnd slq,cl,cThe following relationships exist:
sg,cl,c=1-slq,cl,c 5-21
(5.4) parameters to be calculated for the water transport across the membrane are as follows:
Jlq,cro=Jlq,hyd+Jlq,dmw+Jlq,nd 5-22
simultaneous solution of equations 5-1 to 5-26, combined with well-known mathematical fits, can be used to obtainsg,cl,c,λ。
Will be provided withsg,cl,cCarrying out the step (3) to obtain the mass transfer overpotential; substituting lambda into step (4) to obtain ohmic overpotential, and further adding V solved in steps (2), (3) and (4)act,a、Vact,c、Vcon_a、Vcon_c、VohmAnd (4) substituting each overpotential into the step (1), and obtaining the required input voltage of the electrolytic cell.
In the process of calculating the voltage required by the electrolytic cell, the invention considers the voltage loss caused by various overpotentials in the operation process of the electrolytic cell, analyzes the mass transfer characteristics in the electrolytic cell by solving the two-phase flow mass transfer part in the step (5), and realizes the accurate solution of the mass transfer overpotential and the ohmic overpotential of the electrolytic cell.
The invention has the characteristics and beneficial effects that: the provided modeling method accurately describes the electrochemical reaction mechanism and the internal mass transfer characteristic of the proton exchange membrane electrolytic cell, and simultaneously considers the two-phase transmission characteristic in the electrolytic cell, so that the method has high practical significance and accuracy for predicting the performance (input voltage) of the proton exchange membrane electrolytic cell. The input parameters of the model cover various operating condition parameters (such as temperature, pressure and the like) and battery material design parameters (proton exchange membrane physical properties, porous electrode physical properties and the like) in the running process of the electrolytic cell, namely, the influence of the core parameters on the performance of the electrolytic cell can be effectively predicted, so that a large amount of economic and time cost consumed by experimental tests can be avoided, and the efficiency of the design and optimization process of the electrolytic cell is improved.
Drawings
FIG. 1 shows that the current density I is 0 to 2.0A cm-2The corresponding input voltage of the electrolytic cell changes.
FIG. 2 is a polarization curve for an electrolytic cell operated at a temperature of 313K, 333K, 353K in an example of the invention.
Detailed Description
The method steps of the present invention are further described by the following specific calculation examples, which should be construed as illustrative and not limiting, and the scope of the present invention is not limited thereby.
The model parameters designed in the embodiment of the invention are given in a specific calculation process.
(1) Solving the required input voltage of the electrolytic cell:
V=Voc+Vact_a+Vact_c+Vcon_a+Vcon_c+Vohm 1-1
reversible voltage VocThe calculation can be expressed as:
calculating to obtain Voc=1.1795V。
(2) Solving for the activation overpotentials of the anode and cathode:
the required input voltage increases with increasing operating current density due to the polarization characteristics of the cell, and in one operating regime, the current density-voltage curve of the cell is referred to as the polarization curve, the primary manifestation describing cell performance.
To form the polarization curve, the current density I is set in the range of 0 to 20000A m-2(2.0A cm-2). In the following description of the present embodiment, I is 10000A m-2(1.0A cm-2) The calculation is performed as an example.
αa=αc=0.5,i0,a=0.1A cm-2,i0,c=1000A cm-2. Calculating to obtain Vact,a=0.4096V,Vact,c=0.0764V。
(3) Solving the mass transfer overpotentials of the anode and cathode:
εadl=εcdl0.3, whereinsg,cl,cThe values are determined by the formulas 5-6, 5-16, 5-5 and 5-21 in the step (5).
(4) Solving for ohmic overpotential:
in the formula ofmem=50.4×10-6m,δadl=δcdl=300×10-6m,σs=200S m-1,Rcon=10-5Ωm2. Wherein lambda is obtained by the two-phase flow mass transfer calculation part (5).
(5) Two-phase flow mass transfer calculation
(5.1) anode flow channel:
Jlq,inAin-(Jlq,reac+Jlq,cro)Aact=uout,aclqAinslq,out,a 5-1
The other parameters are intermediate variables which can be eliminated in the simultaneous solution with the subsequent formula.
(5.2) cathode flow channel:
Jlq,croAact=uout,cclqAinslq,out,c-Nvp,out,c 5-9
Nvp,out,c=uout,ccvpAinsg,out,c 5-11
slq,out,c+sg,out,c=1 5-12
water saturation vapor pressure psatThe following relationship exists with temperature:
(5.3) anode and cathode porous electrodes:
sg,cl,c=1-slq,cl,c 5-21
Kadl=Kcdl=10-11m2,μlq=4.05×10-4kg m-1s-1。
(5.4) water transmembrane transport process:
Jlq,cro=Jlq,hyd+Jlq,dmw+Jlq,nd 5-22
Km=10-19m2,ρm=1980kg m-3,EW=1.1kg mol-1,ωa=ωc=0.2。
the relationship between hydraulic pressure and liquid water saturation is described by the Leverett equation in porous electrodes:
at the anode: p is a radical ofg=pap0(ii) a At the cathode: p is a radical ofg=pcp0;σlq=0.0626N m-1。
An empirical fitting formula of the film water content in the catalytic layer and the liquid water saturation in the catalytic layer is as follows:
λa=14+2.8×slq,cl,a 6-5
λc=14+2.8×slq,cl,c 6-6
the water content lambda of the proton exchange membrane in a membrane state can be approximately equal to the average value of the water content of the membrane state in the catalytic layers of the anode and the cathode:
Dmwfitting an empirical formula with the membrane water content lambda of the proton exchange membrane:
ndfitting an empirical formula with the membrane water content lambda of the proton exchange membrane:
in the above process, the formula 6-1 to 6-8 is a well-known mathematical fitting formula, and the combined formula 5-1 to 5-26 and the formula 6-1 to 6-8 are used to obtainsg,cl,c=0.9238,λ=14.8043。
Substituting the lambda solved in the step (5) into the step (4) to obtain Vohm=0.2277V。
V obtained in the step (2)act,a、Vact,cIn step (3), V is obtainedcon_a、Vcon_cIn step (4), V is obtainedohmSubstituting the formula 1-1 in the step (1), the input voltage required for obtaining the electrolytic cell is V-1.8938V.
The above process calculates that I is 1.0A cm-2The required input voltage of the electrolytic cell. The calculated current density I is in the range of 0 to 2.0A cm-2Then, the corresponding cell input voltage forms the polarization curve of the cell, as shown in fig. 1. Therefore, by using the modeling method, the input voltage required by the electrolytic cell under different current densities can be effectively predicted.
Further, the water electrolysis cell can be set to operate at different operating temperatures, namely, the input quantity T of the model is changed, and fig. 2 shows the polarization curves of the electrolysis cell operating at the temperatures of 313K, 333K and 353K, so that the input voltage required by the operation of the electrolysis cell can be found to be gradually reduced along with the increase of the operating temperature. Therefore, by increasing the operation temperature of the electrolytic cell, the voltage required by the electrolytic cell can be effectively reduced, and the energy consumption is increased.
Through the simulation modeling mode, the performance of various electrolytic cell operation conditions can be effectively predicted, a large amount of economic and time cost consumed by experimental tests is avoided, and the efficiency of the electrolytic cell design and optimization process is improved.
Claims (1)
1. The method for establishing the proton exchange membrane electrolytic cell performance prediction model for hydrogen production is characterized by comprising the following steps:
(1) solving for the required input voltage of the cell
V=Voc+Vact_a+Vact_c+Vcon_a+Vcon_c+Vohm 1-1
Wherein V represents the input voltage of the electrolytic cell; vocCan representA reverse voltage; vact_aAnd Vact_cRespectively representing the activation overpotentials of the anode and the cathode; vcon_aAnd Vcon_cRespectively representing the mass transfer overpotential of the anode and the cathode; vohmWhich represents an ohmic over-potential,
wherein a reversible voltage VocThe calculation formula of (A) is as follows:
wherein T is temperature; f is a Faraday constant; r is an ideal gas constant; p is a radical ofaAnd pcAnode oxygen partial pressure and cathode hydrogen partial pressure, respectively;in order to obtain the water activity,
(2) solving for the activation overpotentials of the anode and cathode
Wherein I is the current density; alpha is alphaaAnd alphacThe charge exchange coefficients of the anode and the cathode respectively; i in formulae 2-3 and 2-40,a、i0,cExchange current densities of the anode and cathode, respectively; wherein iref,a、iref,cAre respectively yangReference exchange current densities of the pole and cathode.
(3) Solving mass transfer overpotentials for anode and cathode
In formula 3-3Is the effective oxygen concentration in the anode catalytic layer,is the oxygen concentration; in formulas 3 to 4Is the concentration of hydrogen in the cathode catalytic layer,is the hydrogen concentration;is an oxygen reference concentration;is a hydrogen reference concentration; epsilonadlAnd εcdlAnode and cathode porous electrode porosities, respectively;the oxygen saturation in the porous electrode of the anode; sg,dl-cl,cIs the gas saturation in the porous electrode of the cathode,
(4) solving for ohmic overpotentials
In the formula ofmem、δadl、δcdlThe thicknesses of the anode porous electrode and the cathode porous electrode of the proton exchange membrane respectively; sigmasElectron conductivity for porous electrodes; rconIs a contact resistance; sigmamIs the ionic conductivity of the proton exchange membrane; lambda is the water content of the proton exchange membrane, lambda needs to be solved by the two-phase flow mass transfer calculation part in the step (5),
(5) two-phase flow mass transfer calculation
(5.1) the parameters to be calculated in the anode flow channel are as follows:
Jlq,inAin-(Jlq,reac+Jlq,cro)Aact=uout,aclqAinslq,out,a 5-1
in the formula Jlq,inRepresenting the liquid water flux supplied into the anode flow channels; j. the design is a squarelq,reacRepresents the flux of liquid water consumed by the electrochemical reaction; j. the design is a squarelq,croRepresents the flux of water across the membrane from the anode to the cathode;represents the flux of oxygen generated by the electrochemical reaction; slq,ch,aIndicating the average saturation of liquid water in the anode flow channel; slq,in,a、slq,out,aRespectively representing the liquid water saturation at the inlet and the outlet of the anode runner;represents the average saturation of oxygen in the anode flow channel;respectively representing the oxygen saturation at the inlet and the outlet of the anode runner; a. theinRepresenting the anode flow channel inlet area; a. theactRepresenting the activation area of the electrolytic cell; u. ofout,aRepresenting the flow velocity in the anode flow channel; c. ClqIs liquid water concentration; whereinJlq,reac、Jlq,croThe following equation is obtained:
in the formula p0Which is indicative of the normal atmospheric pressure,
(5.2) the parameters to be calculated in the cathode flow channel are as follows:
Jlq,croAact=uout,cclqAinslq,out,c-Nvp,out,c 5-9
Nvp,out,c=uout,ccvpAinsg,out,c 5-11
slq,out,c+sg,out,c=1 5-12
in the formula Nvp,out,cRepresents the molar flow of water vapor discharged from the outlet of the cathode flow channel;represents the flux of hydrogen gas generated by the electrochemical reaction; u. ofout,cRepresenting the flow rate in the cathode flow channel; slq,ch,cIndicating the liquid in the cathode flow channelState level mean saturation; slq,out,cRespectively representing the liquid water saturation at the outlet of the cathode flow channel; sg,ch,cRepresents the average saturation of the gas in the cathode flow channel; sg,out,cRespectively representing the gas saturation at the outlet of the cathode flow channel; c. CvpIs the water vapor concentration; wherein c isvp、Can be obtained by the following formula:
in the formula psatWhich represents the saturated vapor pressure of water,
(5.3) the parameters to be calculated in the anode and cathode porous electrodes are as follows:
in the formulaRepresents the effective permeability of the anode and cathode porous electrodes, respectively; mu.slqRepresents the dynamic viscosity of liquid water; p is a radical oflq,ch,a、plq,ch,aRespectively represent an anode flow channel and a catalyst layerInternal hydraulic pressure; p is a radical oflq,ch,c、plq,ch,cRespectively representing the hydraulic pressure in the cathode flow channel and the catalytic layer, and describing the relation between the hydraulic pressure and the liquid water saturation by a Leverett equation in the porous electrode, namely plq,ch,a、plq,cl,a、plq,ch,c、plq,cl,cCorresponding solution slq,ch,a、slq,cl,a、slq,ch,c、slq,cl,cAt the same time sO2,cl,a、slq,cl,a、sg,cl,c、slq,cl,cThe following relationships exist:
sg,cl,c=1-slq,cl,c 5-21
(5.4) parameters to be calculated for the water transport across the membrane are as follows:
Jlq,cro=Jlq,hyd+Jlq,dmw+Jlq,nd 5-22
in the formula Jlq,hydRepresenting the flux of water transport across the membrane by hydraulic osmosis; j. the design is a squarelq,dmwFlux of water transport across membrane due to diffusion of water in membrane state, Jlq,ndRepresenting the flux transported by water across the membrane due to the electroosmotic drag effect; kmRepresents the permeability of the proton exchange membrane; rhomRepresents the density of the proton exchange membrane, EW represents the equivalent mass of the proton exchange membrane; dmwRepresents the water diffusivity of the proton exchange membrane,DmwThe correlation with the membrane state water content lambda of the proton exchange membrane can be calculated by a corresponding empirical fitting formula; lambda [ alpha ]a、λcRespectively representing the membrane state water content in the anode and cathode catalytic layers, the numerical value of the membrane state water content and the liquid water saturation s in the catalytic layerslq,cl,a、slq,cl,cCorrelation, which can be calculated by a corresponding empirical fit formula; omegaaAnd ωcRespectively representing the electrolyte content in the anode and cathode catalytic layers; n isdDenotes the electroosmotic drag coefficient, ndThe correlation with the membrane state water content lambda of the proton exchange membrane can be calculated by a corresponding empirical fitting formula; the water content lambda of the proton exchange membrane is equal to the average value of the water content of the membrane in the anode catalytic layer and the cathode catalytic layer:
from 5-1 to 5-26 in tandem, in combination with well-known mathematical fits, can be foundsg,cl,c,λ,
Will be provided withsg,cl,cThe step (3) is carried out to obtain the mass transfer overpotential Vcon_a、Vcon_c(ii) a Substituting lambda into step (4) to determine the ohmic overpotential VohmFurther, V solved in steps (2), (3) and (4)act,a、Vact,c、Vcon_a、Vcon_c、VohmAnd (3) carrying out the step (1) by each overpotential, so as to obtain the required input voltage of the electrolytic cell.
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