Sodium fire combustion analysis method, system, electronic device and storage medium

Abstract

The present invention provides a sodium fire combustion analysis method, system, electronic device and storage medium, the method comprising: constructing a spatial model of a process room where sodium fire combustion occurs, the spatial model being constructed to include a gas space, a wall surface located at the top of the process room, and a sodium pool located below the flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node and a bottom gas space node, the upper gas space node being adjacent to the wall surface, the lower gas space node being adjacent to the flame zone surface of the sodium fire combustion, and the bottom gas space node being adjacent to the ground of the process room; according to the combustion conditions and gas circulation conditions of the sodium fire combustion, the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node are obtained based on the mass balance principle and the energy balance principle. The present invention can obtain the impact of a sodium fire combustion accident on different areas of the process room.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power simulation technology, and in particular to a sodium fire combustion analysis method, system, electronic equipment and storage medium. Background Art

[0002] Nuclear power plant simulators are primarily used for training nuclear power plant operators, design optimization and verification, and technical modification verification. The Rinsim platform is an integrated simulation platform for nuclear power plants, providing full-lifecycle support for the development of nuclear power plant and nuclear power simulation systems.

[0003] The development and implementation of the single-phase sodium flow network on the Rinsim platform currently lacks consideration for the impact of sodium fire accidents, a physical phenomenon associated with sodium leaks, on process room temperature and pressure. Sodium fires (also known as sodium fire reactions) are unique to sodium-cooled fast reactors. When coolant sodium leaks into the process room within the loop, it combusts upon encountering oxygen. The high-velocity ejected sodium typically forms a spray sodium fire, and unburned sodium settles on the ground, forming a sodium pool. Safety issues associated with sodium fires often require significant attention.

[0004] Therefore, it is necessary to study the sodium fire combustion accident model during the development of the single-phase sodium flow network, so as to subdivide the temperature and pressure of different areas in the sodium process room when a sodium fire combustion accident occurs, and carefully reflect the changes in temperature and pressure in the process room during the sodium fire combustion process, which meets the requirements for temperature and pressure monitoring in different areas when a sodium fire accident occurs in the actual sodium process room. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a sodium fire combustion analysis method, system, electronic equipment and storage medium to obtain the impact of sodium fire combustion accidents on different areas of the process room.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a sodium fire combustion analysis method, comprising:

[0008] Constructing a spatial model of a process room where sodium fire combustion occurs, the spatial model being constructed to include a gas space, a wall located at the top of the process room, and a sodium pool located below the flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node, and a bottom gas space node, wherein the upper gas space node is adjacent to the wall, the lower gas space node is adjacent to the surface of the flame zone of the sodium fire combustion, and the bottom gas space node is adjacent to the floor of the process room;

[0009] Based on the spatial model, the combustion condition of the sodium fire is obtained according to the chemical reaction mechanism of the sodium fire combustion;

[0010] Obtaining gas flow conditions between the upper gas space node, the lower gas space node, and the bottom gas space node;

[0011] According to the combustion conditions of the sodium fire and the gas circulation conditions, the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node are obtained based on the mass balance principle and the energy balance principle;

[0012] The temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node are displayed.

[0013] Furthermore, the obtaining of the combustion conditions of the sodium fire combustion includes: according to the chemical reaction mechanism of the sodium fire combustion, calculating the combustion rate of oxygen during the sodium fire combustion, the mass of metallic sodium after the sodium fire combustion reaction, the mass of oxygen remaining in the process room after the sodium fire combustion reaction, the mass of sodium peroxide generated by the sodium fire combustion reaction, the mass of sodium oxide generated by the sodium fire combustion reaction, the mass of the mixture of sodium and sodium oxide remaining after the sodium fire combustion, the flow rates of the sodium peroxide aerosol and the sodium oxide aerosol generated by the sodium fire combustion entering the lower gas space node respectively, the temperature of the mixture of sodium and sodium after the sodium fire combustion, the radiation heat exchange between the sodium pool and the lower gas space node during the sodium fire combustion, the convection heat exchange between the sodium pool and the lower gas space node, and the molar heat released when the sodium fire combustion generates sodium peroxide and sodium oxide.

[0014] Furthermore, obtaining the gas circulation conditions between the upper gas space node, the lower gas space node and the bottom gas space node includes: calculating the flow rate of the lower gas space node flowing into the upper gas space node, the flow rate of the upper gas space node flowing into the bottom gas space node, and the flow rate of the bottom gas space node flowing into the lower gas space node.

[0015] Furthermore, obtaining the temperature and pressure of the gas at the lower gas space node includes:

[0016] Calculating the lower gas mass corresponding to the lower gas space node according to the mass balance principle, and calculating the lower gas pressure corresponding to the lower gas space node according to the lower gas mass;

[0017] According to the energy balance principle, the heat absorbed by the lower gas corresponding to the lower gas space node is calculated, and the lower gas temperature corresponding to the lower gas space node is calculated based on the lower gas heat.

[0018] Furthermore, obtaining the temperature and pressure of the gas at the upper gas space node includes:

[0019] Calculating the upper gas mass corresponding to the upper gas space node according to the mass balance principle, and calculating the upper gas pressure corresponding to the upper gas space node according to the upper gas mass;

[0020] According to the energy balance principle, the heat absorbed by the upper gas corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated based on the upper gas heat.

[0021] Furthermore, obtaining the temperature and pressure of the gas at the bottom gas space node includes:

[0022] Calculating the bottom gas mass corresponding to the bottom gas space node according to the mass balance principle, and calculating the bottom gas pressure corresponding to the bottom gas space node according to the bottom gas mass;

[0023] According to the energy balance principle, the bottom gas absorption heat corresponding to the bottom gas space node is calculated, and the bottom gas temperature corresponding to the bottom gas space node is calculated based on the bottom gas heat.

[0024] Furthermore, the method further comprises: generating a sodium fire model component based on the Rinsim platform, wherein the sodium fire model component is used to simulate a process room where sodium fire combustion occurs;

[0025] The displaying of the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node includes:

[0026] The temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node are graphically displayed based on the sodium fire model component.

[0027] In a second aspect, the present invention provides a sodium fire combustion analysis system, comprising:

[0028] a modeling module for constructing a spatial model of a process room where sodium fire combustion occurs, the spatial model being constructed to include a gas space, a wall located at a top of the process room, and a sodium pool located below a flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node, and a bottom gas space node, the upper gas space node being adjacent to the wall, the lower gas space node being adjacent to a surface of the flame zone of the sodium fire combustion, and the bottom gas space node being adjacent to a floor of the process room;

[0029] an analysis module for obtaining, based on the spatial model and according to the chemical reaction mechanism of sodium fire combustion, a combustion condition of the sodium fire combustion, and obtaining a gas circulation condition between the upper gas space node, the lower gas space node, and the bottom gas space node; and then obtaining, based on the mass balance principle and the energy balance principle, a temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node according to the combustion condition of the sodium fire combustion and the gas circulation condition;

[0030] The display module is used to display the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node.

[0031] In a third aspect, the present invention provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the sodium fire combustion analysis method as described above when executing the computer program.

[0032] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the sodium fire combustion analysis method as described above.

[0033] The present invention adopts the idea of ​​nodeization. Under the spatial model of the sodium fire combustion process room, the gas space is simplified into three gas space nodes: upper, lower and bottom. Based on the combustion conditions of the sodium fire combustion and the gas circulation conditions of different gas spaces, the temperature and pressure changes of the upper gas space, the lower gas space and the bottom gas space are analyzed according to the mass balance principle and the energy balance principle. Therefore, the changes in temperature and pressure in the process room during the sodium fire combustion process can be reflected in detail, which meets the requirements for monitoring temperature and pressure parameters in different areas when a sodium fire accident occurs in an actual sodium process room. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Flowchart of the sodium fire combustion analysis method according to Example 1 of the present invention;

[0035] Figure 2 Schematic diagram of the space model established in Example 1 of the present invention;

[0036] Figure 3 This is a hardware architecture diagram of an electronic device according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0039] Before introducing the specific solutions of the present invention, the following first introduces the definitions of the relevant parameters involved in the present invention:

[0040] flu1: flow rate (kg / s) from the lower gas space node (also referred to as the upper gas space, upper space, or upper part) to the upper gas space node (also referred to as the lower gas space, lower space, or lower part)

[0041] flu2: flow rate (kg / s) from the upper gas space node to the bottom gas space node (referred to as the bottom gas space, bottom space, or bottom)

[0042] flu3: flow rate from the bottom gas space node to the lower gas space node (kg / s)

[0043] fna: flow rate of sodium into the process room (kg / s)

[0044] fn2: nitrogen flow rate into the bottom (kg / s)

[0045] fairin: ventilation flow rate flowing into the upper part (kg / s)

[0046] fairout: outflow upper ventilation flow (kg / s)

[0047] fna2o2: flow rate of sodium peroxide aerosol generated by sodium fire reaction entering the lower space (kg / s)

[0048] fna2o: flow rate of sodium oxide aerosol generated by sodium fire reaction entering the lower space (kg / s)

[0049] con1o2: oxygen concentration in the lower part (%)

[0050] con1n2: Nitrogen concentration in the lower part (%)

[0051] con1na2o2: lower aerosol sodium peroxide aerosol concentration (%)

[0052] con1na2o: lower aerosol sodium oxide aerosol concentration (%)

[0053] con2o2: upper oxygen species concentration (%)

[0054] con2n2: Upper nitrogen concentration (%)

[0055] con2na2o2: Upper aerosol sodium peroxide aerosol concentration (%)

[0056] con2na2o: Upper aerosol sodium oxide aerosol concentration (%)

[0057] con3o2: bottom oxygen species concentration (%)

[0058] con3n2: bottom nitrogen concentration (%)

[0059] con3na2o2: Bottom aerosol sodium peroxide aerosol concentration (%)

[0060] con3na2o: Bottom aerosol sodium oxide aerosol material concentration (%)

[0061] cpbottom: average specific heat capacity of the lower gas (J / (kg*K))

[0062] cptop: average specific heat capacity of upper gas (J / (kg*K))

[0063] cproot: average specific heat capacity of bottom gas (J / (kg*K))

[0064] cpn2: Nitrogen specific heat capacity 1039 (J / (kg*K))

[0065] cpo2: oxygen specific heat capacity 915 (J / (kg*K))

[0066] cpna2o2: specific heat capacity of flue gas sodium peroxide 1042 (J / (kg*K))

[0067] cpna2o: specific heat capacity of flue gas sodium oxide 1042 (J / (kg*K))

[0068] burn: oxygen combustion rate (kg / s)

[0069] pbottom: bottom gas pressure (kpa)

[0070] ptop: upper gas pressure (kpa)

[0071] proot: bottom gas pressure (kpa)

[0072] tbottom: bottom gas temperature (℃)

[0073] ttop: upper gas temperature (℃)

[0074] troot: bottom gas temperature (℃)

[0075] tna: sodium temperature (℃)

[0076] tnao: Temperature of the sodium oxide mixture after combustion reaction (℃)

[0077] tamt: ambient temperature 20 (℃)

[0078] ttopin: Temperature of the upper inflowing gas (℃)

[0079] trootin: Temperature of nitrogen flowing into the bottom (℃)

[0080] hbottom: lower gas enthalpy (j / kg)

[0081] htop: upper gas enthalpy (j / kg)

[0082] h1top: enthalpy of gas flowing into the top (j / kg)

[0083] hroot: bottom gas enthalpy (J / kg)

[0084] hna: enthalpy of sodium flowing into the process room (J / kg)

[0085] hnao: enthalpy of solid sodium oxide mixture (J / kg)

[0086] h3n2: enthalpy of nitrogen flowing into the bottom of the process room (J / kg)

[0087] massna: mass of sodium in the process room (kg)

[0088] massbottom: lower gas mass (kg)

[0089] masstop: upper gas mass (kg)

[0090] massroot: bottom gas mass (kg)

[0091] mass1n2: lower nitrogen mass (kg)

[0092] mass1o2: mass of oxygen in the lower part (kg)

[0093] mass1na2o2: mass of sodium peroxide aerosol in the lower part (kg)

[0094] mass1na2o: mass of lower sodium oxide aerosol (kg)

[0095] mass2n2: upper nitrogen mass (kg)

[0096] mass2o2: upper oxygen mass (kg)

[0097] mass2na2o2: mass of upper sodium peroxide aerosol (kg)

[0098] mass2na2o: mass of upper sodium oxide aerosol (kg)

[0099] mass3n2: bottom nitrogen mass (kg)

[0100] mass3o2: bottom oxygen mass (kg)

[0101] mass3na2o2: mass of sodium peroxide aerosol at the bottom (kg)

[0102] mass3na2o: mass of sodium oxide aerosol at the bottom (kg)

[0103] masso2: total mass of oxygen in the process room (kg)

[0104] massna2o2: the mass of sodium peroxide generated by the sodium fire reaction (kg)

[0105] massna2o: the mass of sodium oxide produced by the sodium fire reaction (kg)

[0106] massnao: the mass of the mixture of sodium and sodium oxide after sodium combustion (kg)

[0107] molbottom,moltop,molroot: relative molecular mass of the lower, upper, and bottom gases

[0108] vbottom, vtop, vroot: bottom, top, and bottom volume (m 3 )

[0109] coev: bottom volume division coefficient (0-1)

[0110] vroom: volume of process room (i.e. process room) (m 3 )

[0111] abottom: lower heat exchange area size (m 2 )

[0112] atop: upper heat exchange area size (m 2 )

[0113] aroot: bottom heat exchange area size (m 2 )

[0114] coef1: Sodium combustion and upper gas space convection heat transfer coefficient

[0115] coef2: Sodium combustion and upper gas space radiation heat transfer coefficient

[0116] coef3: Convection heat transfer coefficient of lower gas and upper gas space

[0117] coef4: Convection heat transfer coefficient between upper gas space and wall

[0118] coef5: Convection heat transfer coefficient of upper gas space and bottom

[0119] coefna2o2: The ratio coefficient of sodium peroxide generated by combustion to sodium peroxide aerosol (0-1)

[0120] coefna2o: The ratio coefficient of sodium oxide generated by combustion reaction to sodium oxide aerosol

[0121] com: The fraction of oxygen consumed to generate sodium peroxide (0-1)

[0122] gsbv: oxygen and sodium combustion reaction factor (0-1)

[0123] agsbv: surface area coefficient of the bottom sodium pool in the process room

[0124] kcoe1: flow conductance from lower part to upper part

[0125] kcoe2: flow from top to bottom

[0126] kcoe3: bottom to lower conductance

[0127] dtt: time

[0128] qcoef1: Sodium combustion and convection heat transfer in the upper gas space

[0129] qcoef2: Sodium combustion and radiation heat transfer in the upper gas space

[0130] qcoef3: Convective heat transfer between lower and upper gases

[0131] qcoef4: heat exchange between upper gas and wall environment

[0132] qcoef5: Convective heat transfer between upper and bottom gases

[0133] qflame: chemical heat released by the sodium combustion reaction (j)

[0134] qbottom: heat absorbed by the lower gas (j)

[0135] qtop: heat absorbed by the upper gas (j)

[0136] qroot: heat absorbed by the bottom gas (j)

[0137] qna: heat absorbed by the combustion of metallic sodium and sodium oxide (j)

[0138] qamt: heat dissipated by the upper gas to the environment

[0139] Example 1

[0140] As we all know, sodium is a soft, silvery-white metal that melts at 98°C. Sodium ignites in an atmosphere containing oxygen, forming various oxides. However, two major oxides are formed: Na₂O and Na₂O₂. Sodium ignition is accompanied by the following chemical reactions:

[0141]

[0142] 2Na+O2→Na2O2ΔH=-513kj / mol

[0143] ΔH is the heat of reaction, and the reaction is exothermic. When sodium ignites, flames and thick white smoke are produced. Not all of the burning sodium forms smoke; most of the sodium remains as oxides and unreacted sodium. The residual reaction products and smoke include Na₂O and Na₂O₂. In the presence of excess oxygen, Na₂O₂ is the primary reaction product; in the presence of excess sodium, Na₂O is the primary reaction product.

[0144] When a sodium pipeline ruptures, the sodium leaks into the sodium process room. When oxygen is present in the sodium process room, a chemical reaction similar to a sodium fire occurs, releasing heat. This heat causes the temperature and pressure of the sodium pool and the process room to rise. During the sodium fire, the oxygen in the lower gas space, which contacts the sodium pool, initially provides the necessary oxygen for ignition. Therefore, the sodium fire primarily consumes oxygen in this lower gas space. As the reaction progresses, flame radiation, gas circulation, and convective heat transfer cause changes in the gas composition and oxygen concentration throughout the sodium process room.

[0145] In order to analyze the impact of sodium fire combustion accidents on the process room, this embodiment provides a sodium fire combustion analysis method, such as Figure 1 As shown, the method specifically includes the following steps:

[0146] S1, construct the spatial model of the process room where sodium fire combustion occurs, such as Figure 2As shown, the space model is constructed to include a gas space, a wall located at the top of the process room, and a sodium pool located below the flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node and a bottom gas space node, the upper gas space node is adjacent to the wall, the lower gas space node is adjacent to the surface of the flame zone of the sodium fire combustion, and the bottom gas space node is adjacent to the ground of the process room.

[0147] When a sodium fire combustion reaction occurs, the three gas spaces can circulate according to the different pressures of the nodes, which can conform to the flow conditions of the gas during the actual combustion reaction; at the same time, the temperature also varies according to the different node spaces it is divided into. For example, the gas temperature near the sodium combustion flame zone is higher, and the temperature far away from the flame zone and close to the wall of the sodium process room is lower.

[0148] During the sodium fire combustion process, the energy transfer process is as follows: the flame zone after the combustion of sodium and oxygen transfers heat to the lower gas space through radiation and convection heat transfer; the lower gas space transfers heat to the upper gas space through convection heat transfer; the upper gas space transfers heat to the wall at the top of the sodium process room through convection heat transfer.

[0149] During sodium fire combustion, the mass conservation process is as follows: A portion of the oxygen consumed by the sodium fire is converted into flue gases, Na2O and Na2O2, which enter the lower gas space, while the remaining portion is converted into solid particles of combustion products and remains on the surface of the sodium pool. Due to the initial temperature rise and the incoming flue gas, the gas pressure in the lower gas space is slightly higher than that in the upper and bottom gas spaces. The oxygen consumption in the bottom gas space also decreases relative to the pressure in the lower gas space. Therefore, the gas in the lower gas space flows into the upper and bottom gas spaces, respectively.

[0150] S2, based on the constructed spatial model, obtains the combustion conditions of sodium fire according to the chemical reaction mechanism of sodium fire combustion;

[0151] S3, obtaining gas flow conditions between the upper gas space node, the lower gas space node, and the bottom gas space node;

[0152] S4, according to the combustion conditions of the sodium fire and the gas circulation conditions, based on the mass balance principle and the energy balance principle, obtaining the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node;

[0153] S5 , displaying the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node.

[0154] In this embodiment, the process of obtaining the combustion condition of sodium fire combustion according to the chemical reaction mechanism of sodium fire combustion in step S2 is as follows:

[0155] The burning rate of oxygen during sodium fire combustion is calculated using formula (1):

[0156] burn=(massroot / vroot)*(massna*agsbv)*con3o2*0.14*

[0157] 6.4315e^(-5)*((tnao–troot)*1.832)*((tnao–troot)*0.333)*

[0158] gsbv / (ptop*0.001) (1) The mass of metallic sodium after the sodium fire combustion reaction is calculated according to formula (2):

[0159] massna=massna+fna*dtt-burn*com*11.4375

[0160] -burn*(1-com)*2.875 (2) The remaining oxygen mass mass2 in the process room after the sodium fire combustion reaction is calculated according to formula (3):

[0161] masso2=mass1o2+mass2o2+mass3o2-burn*dtt (3) Calculate the mass of sodium peroxide (kg) generated by the sodium fire combustion reaction using formula (4):

[0162] massna2o2=massna2o2+burn*com*2.435 (4) Calculate the mass of sodium oxide (kg) generated by the sodium fire combustion reaction using formula (5):

[0163] massna2o=massna2o+burn*(1-com)*3.875 (5) Calculate the mass of the mixture of sodium and sodium oxides remaining after sodium combustion, massnao (kg), according to formula (6):

[0164] massnao=massna+massna2o2*(1-coefna2o2)

[0165] +massna2o*(1-coefna2o) (6)

[0166] The mass of the flue gas mixture produced by sodium combustion (including the mass of sodium peroxide mass Na2O2 and the mass of sodium oxide mass Na2O) is calculated according to formula (7) and formula (8):

[0167] massna2o2=massna2o2+burn*com*2.435 (7)

[0168] massna2o=massna2o+burn*(1-com)*3.875 (8)

[0169] The flow rates fna2o2 and fna2o (kg / s) of sodium peroxide aerosol (also called gaseous sodium peroxide) and sodium oxide aerosol (also called gaseous sodium oxide) generated by the sodium fire reaction and entering the lower space are calculated according to the following formulas (9) and (10):

[0170] fna2o2=(burn*com*2.435)*coefna2o2 (9)

[0171] fna2o=(burn*(1-com)*3.875)*coefna2o (10)

[0172] The temperature tnao (°C) of the mixture of sodium and sodium after sodium fire combustion is calculated according to formula (11):

[0173] tnao=tnao+qna / (massnao*1300) (11)

[0174] The radiation heat exchange qcoef2(j) between the sodium pool and the lower space during sodium fire combustion is calculated using formula (12):

[0175] qcoef2=coef2*abottom*(tnao 4 -tbottom 4 ) (12)

[0176] The convective heat transfer qcoef1 between the sodium pool and the lower space is calculated according to formula (13):

[0177] qcoef1=coef1*abottom*(tnao-tbottom) (13)

[0178] The molar heat qflame(j) released when sodium burns to generate sodium peroxide and sodium oxide is calculated using formula (14):

[0179]

[0180] The heat qna(j) absorbed or released by the mixture of sodium and sodium oxide after sodium fire combustion is calculated according to formula (15):

[0181] qna=qflame-qcoef1-qcoef2+(tna-tnao)*1300*fna*dtt (15)

[0182] The relevant parameters are described as follows:

[0183] vbottom, vtop, vroot: the volume of the bottom, top, and bottom spaces (m 3 )(External setting)

[0184] dtt: reaction time (s) (externally given)

[0185] com: Oxygen fraction consumed to generate sodium peroxide (externally given)

[0186] gsbv: oxygen and sodium combustion reaction factor (externally given)

[0187] agsbv: surface area coefficient of the sodium pool at the bottom of the process room (externally given)

[0188] abottom: lower heat exchange area size (externally given)

[0189] atop: upper heat exchange area size (externally given)

[0190] aroot: bottom heat exchange area size (externally given)

[0191] coef1: Convection heat transfer coefficient of sodium combustion and upper gas space (externally given)

[0192] coef2: Sodium combustion and radiation heat transfer coefficient of the upper gas space (externally given)

[0193] coef3: Convection heat transfer coefficient of the lower gas and upper gas space (externally given)

[0194] coef4: Convection heat transfer coefficient between the upper gas space and the wall (externally given)

[0195] coef5: Convection heat transfer coefficient between the upper gas space and the bottom (externally given)

[0196] coefna2o2: The ratio coefficient (0-1) of sodium peroxide generated by the combustion reaction to sodium peroxide aerosol (given externally)

[0197] coefna2o: The ratio coefficient (0-1) of the conversion of sodium oxide generated by the combustion reaction into sodium oxide aerosol (externally given)

[0198] In this embodiment, the process of analyzing the gas circulation between the upper gas space, the lower gas space, and the bottom gas space in step S3 is as follows:

[0199] The flow rate flu1 from the lower part to the upper gas space is calculated according to formula (16):

[0200] flu1=(kcoe1*(pbottom-ptop)) 0.5 (16)

[0201] The flow rate flu2 from the upper part to the bottom gas space is calculated according to formula (17):

[0202] flu2=(kcoe2*(ptop-proot)) 0.5 (17)

[0203] The flow rate flu3 from the bottom into the lower gas space is calculated according to formula (18):

[0204] flu3=(kcoe3*(proot-pbottom)) 0.5 (18)

[0205] The relevant parameters are described as follows:

[0206] Pbottom: Bottom gas pressure (kpa)

[0207] Ptop: upper gas pressure (kpa)

[0208] Proot: bottom gas pressure (kpa)

[0209] kcoe1: resistance coefficient from lower flow to upper flow (externally given)

[0210] kcoe2: resistance coefficient from top to bottom (externally given)

[0211] kcoe3: bottom to lower resistance coefficient (externally given)

[0212] In this embodiment, step S4 calculates the mass of the lower gas corresponding to the lower gas space node according to the mass balance principle, and calculates the lower gas pressure corresponding to the lower gas space node according to the lower gas mass; calculates the heat absorbed by the lower gas corresponding to the lower gas space node according to the energy balance principle, and calculates the lower gas temperature corresponding to the lower gas space node according to the lower gas heat. The specific analysis process is as follows:

[0213] Mass balance process:

[0214] Calculate the lower oxygen mass mass1o2 (kg) according to formula (19):

[0215] mass1o2=mass1o2+con3o2*flu3*dtt-con1o2*flu1*dtt (19) Calculate the lower nitrogen mass mass1n2 (kg) according to formula (20):

[0216] mass1n2=mass1n2+con3n2*flu3*dtt-con1n2*flu1*dtt (20)

[0217] The mass of sodium peroxide aerosol mass1na2o2 (kg) generated by the sodium fire reaction and entering the lower space is calculated using formula (21):

[0218] mass1na2o2=mass1na2o2+burn*com*2.435*coefna2o2+

[0219] con3na2o2*flu3*dtt-con3na2o2*flu1*dtt (21)

[0220] The mass of sodium peroxide aerosol generated by the sodium fire reaction and entering the lower space is calculated as mass1na2o (kg) according to formula (22):

[0221] mass1na2o=mass1na2o+burn*(1-com)*3.875*coefna2o+

[0222] con3na2o*flu3*dtt-con3na2o*flu1*dtt (22)

[0223] Calculate the lower gas mass massbottom (kg) according to formula (23):

[0224] massbottom=mass1n2+mass1o2+mass1na2o2+mass1na2o (23)

[0225] The lower oxygen concentration con1o2, the lower nitrogen concentration con1n2, the lower sodium peroxide gas concentration con1na2o2, and the lower sodium oxide gas concentration con1na2o are calculated according to the following formulas (24) to (27):

[0226] con1o2=mass1o2 / massbottom (24)

[0227] con1n2=mass1n2 / massbottom (25)

[0228] con1na2o2=mass1na2o2 / massbottom (26)

[0229] con1na2o=mass1na2o / massbottom (27)

[0230] The lower average gas specific heat capacity cpbottom is calculated according to formula (28):

[0231] cpbottom=con1o2*cpo2+con1n2*cpn2+con1na2o2*cpna2o2+

[0232] con1na2o*cpna2o (28) The average relative molecular mass of the lower gas, molbottom, is calculated according to formula (29):

[0233] molbottom=con1o2*32+con1n2*28

[0234] +con1na2o2*78+con1na2o*62 (29) The lower gas pressure pbottom (kPa) is calculated according to formula (30):

[0235] pbottom=massbottom*(tbottom+273.15)*8.314

[0236] *1000 / (vbottom*molbottom) (30) Lower energy balance process:

[0237] The convective heat transfer between the sodium pool and the lower space abottom(j) is calculated according to formula (31):

[0238] abottom=massnao*agsbv (31) The convective heat transfer qcoef1(j) between the sodium pool and the lower gas space is calculated according to formula (32):

[0239] qcoef1=coef1*abottom*(tnao-tbottom) (32) The lower gas enthalpy hbottom (kj / kg) is calculated according to formula (33):

[0240] hbottom=cpbottom*(273.15+thottom) (33) The heat absorbed by the lower gas qbottom(j) is calculated according to formula (34):

[0241] qbottom=qcoef1+qcoef2+(tnao-tbottom)*cpbottom*fna2o2+

[0242] (tnao-tbottom)*cpbottom*fna2o+(troot-thottom)*

[0243] cpbottom*flu3*dtt+(ttop-tbottom)*cpbottom1 (34) The lower gas temperature tbottom (°C) is calculated according to formula (35):

[0244] tbottom=tbottom+qbottom / (cpbottom*massbottom) (35)

[0245] Related parameter description:

[0246] vbottom, vtop, vroot: bottom, top, and bottom volume (m 3 )(External setting)

[0247] dtt: reaction time (s) (externally given)

[0248] com: Oxygen fraction consumed to generate sodium peroxide (externally given)

[0249] gsbv: oxygen and sodium combustion reaction factor (externally given)

[0250] agsbv: surface area coefficient of the sodium pool at the bottom of the process room (externally given)

[0251] abottom: lower heat exchange area size (externally given)

[0252] atop: upper heat exchange area size (externally given)

[0253] aroot: bottom heat exchange area size (externally given)

[0254] coef1: Sodium combustion and upper gas space convection heat transfer coefficient (externally given)

[0255] coef2: Sodium combustion and upper gas space radiation heat transfer coefficient (externally given)

[0256] coef3: Convection heat transfer coefficient between the lower gas and upper gas space (externally given)

[0257] coef4: Convection heat transfer coefficient between upper gas space and wall (externally given)

[0258] coef5: Convection heat transfer coefficient of upper gas space and bottom (externally given)

[0259] coefna2o2: The ratio coefficient (0-1) of sodium peroxide generated by the combustion reaction to sodium peroxide aerosol (given externally)

[0260] coefna2o: The ratio coefficient (0-1) of the conversion of sodium oxide generated by the combustion reaction into sodium oxide aerosol (externally given)

[0261] In this embodiment, step S4 calculates the upper gas mass corresponding to the upper gas space node according to the mass balance principle, and calculates the upper gas pressure corresponding to the upper gas space node according to the upper gas mass; calculates the upper gas absorbed heat corresponding to the upper gas space node according to the energy balance principle, and calculates the upper gas temperature corresponding to the upper gas space node according to the upper gas heat. The specific analysis process is as follows:

[0262] Mass balance process:

[0263] Calculate the upper oxygen mass mass2o2 (kg) according to formula (36):

[0264] mass2o2=mass2o2+con1o2*flu1*dtt-con2o2*flu2*dtt+

[0265] 0.21*fairin*dtt-con2o2*fairout*dtt (36) Calculate the upper oxygen mass mass2n2 (kg) according to formula (37):

[0266] mass2n2=mass2n2+con1n2*flu1*dtt-con2n2*flu2*dtt+

[0267] 0.79*fairin*dtt-con2n2*fairout*dtt (37) Calculate the mass of the upper sodium peroxide mass2na2o2 (kg) according to formula (38):

[0268] mass2na2o2=mass2na2o2+con1na2o2*flu1*dtt-con2na2o2

[0269] *flu2*dtt-con2na2o2*fairout*dtt (38) Calculate the mass of upper sodium oxide mass2na2o (kg) according to formula (39):

[0270] mass2na2o=mass2na2o+con1na2o*flu1*dtt-con2na2o

[0271] *flu2*dtt-con2na2o*fairout*dtt (39) Calculate the upper gas mass masstop (kg) according to formula (40):

[0272] masstop=mass2n2+mass2o2+mass2na2o2+mass2na2o (40)

[0273] Calculate the upper oxygen concentration con2o2, upper nitrogen concentration con2n2, and upper sodium peroxide concentration con2n2 according to the following formulas (41)-(44): Gas concentration con2na2o2, upper sodium oxide gas concentration con2na2o:

[0274] con2o2=mass2o2 / masstop (41)

[0275] con2n2=mass2n2 / masstop (42)

[0276] con2na2o2=mass2na2o2 / masstop (43)

[0277] con2na2o=mass2na2o / masstop (44) The upper average gas specific heat capacity cptop is calculated according to formula (45):

[0278] cptop=con2o2*cpo2+con2n2*cpn2+con2na2o2*

[0279] cpna2o2+con2na2o*cpna2o (45) The average relative molecular mass of the upper gas, moltop, is calculated according to formula (46):

[0280] moltop=con2o2*32+con2n2*28+con2na2o2*78

[0281] +con2na2o*62 (46) The upper gas pressure ptop (kPa) is calculated according to formula (47):

[0282] ptop=mastop*(ttop+273.15)*8.314*1000 / (vtop*moltop) (47)

[0283] Upper energy balance process:

[0284] The heat exchange between the lower gas and upper gas space qcoef3(j) is calculated according to formula (48):

[0285] qcoef3=coef3*atop*(tbottom-ttop) (48) The heat exchange between the upper gas and the wall environment space qamt(j) is calculated according to formula (49):

[0286] qamt=coef4*atop*(ttop-tamt) (49) The upper gas enthalpy htop(j) is calculated according to formula (50):

[0287] htop=cptop*(273.15+ttop) (50) The heat absorbed by the upper gas qtop(j) is calculated according to formula (51):

[0288] qtop=

[0289] qcoef3-qamt+(tbottom-ttop)*cptop*dmax1(flu1,0.0)*

[0290] dtt+(troot-ttop)*cptop*flu2*dtt+(ttopin-ttop)*

[0291] cptop*fairin*dtt (51)

[0292] The upper gas temperature ttop is calculated according to formula (52):

[0293] ttop=ttop+qtop / (cptop*mastop) (52) Related parameter description:

[0294] fairin: ventilation flow rate flowing into the upper part [kg / s] (externally given)

[0295] vbottom, vtop, vroot: bottom, top, and bottom volume (m 3 )(External setting)

[0296] dtt: reaction time (s) (externally given)

[0297] com: Oxygen fraction consumed to generate sodium peroxide (externally given)

[0298] gsbv: oxygen and sodium combustion reaction factor (externally given)

[0299] agsbv: surface area coefficient of the sodium pool at the bottom of the process room (externally given)

[0300] abottom: lower heat exchange area size (externally given)

[0301] atop: upper heat exchange area size (externally given)

[0302] aroot: bottom heat exchange area size (externally given)

[0303] coef1: Sodium combustion and upper gas space convection heat transfer coefficient (externally given)

[0304] coef2: Sodium combustion and upper gas space radiation heat transfer coefficient (externally given)

[0305] coef3: Convection heat transfer coefficient between the lower gas and upper gas space (externally given)

[0306] coef4: Convection heat transfer coefficient between upper gas space and wall (externally given)

[0307] coef5: Convection heat transfer coefficient of upper gas space and bottom (externally given)

[0308] coefna2o2: The ratio coefficient (0-1) of sodium peroxide generated by the combustion reaction to sodium peroxide aerosol (given externally)

[0309] coefna2o: The ratio coefficient (0-1) of the conversion of sodium oxide generated by the combustion reaction into sodium oxide aerosol (externally given)

[0310] In this embodiment, step S4 calculates the bottom gas mass corresponding to the bottom gas space node according to the mass balance principle, and calculates the bottom gas pressure corresponding to the bottom gas space node according to the bottom gas mass; calculates the bottom gas absorbed heat corresponding to the bottom gas space node according to the energy balance principle, and calculates the bottom gas temperature corresponding to the bottom gas space node according to the bottom gas heat. The specific analysis process is as follows:

[0311] Mass balance process:

[0312] Calculate the bottom oxygen gas mass3o2(kg) according to formula (53):

[0313] mass3o2=mass3o2+con2o2*flu2*dtt

[0314] -con3o2*flu3*dtt-burn*dtt (53) The bottom nitrogen gas mass mass3n2 (kg) is calculated according to formula (54):

[0315] mass3n2=mass3n2+con2n2*flu2*dtt

[0316] -con3n2*flu3*dtt+fn2*dtt (54) Calculate the mass of sodium peroxide at the bottom mass3na2o2 (kg) according to formula (55):

[0317] mass3na2o2=mass3na2o2+con2na2o2*flu2*dtt-

[0318] con3na2o2*flu3*dtt (55) Calculate the mass of sodium oxide at the bottom mass3na2o (kg) according to formula (56):

[0319] mass3na2o=mass3na2o+con2na2o*flu2*dtt

[0320] -con3na2o*flu3*dtt (56) Calculate the bottom gas mass root (kg) according to formula (57):

[0321] massroot=mass3n2+mass3o2+mass3na2o2+mass3na2o (57)

[0322] The upper oxygen concentration con3o2, the upper nitrogen concentration con3n2, the upper sodium peroxide gas concentration con3na2o2, and the upper sodium oxide gas concentration con3na2o are calculated according to the following formulas (58)-(61):

[0323] con3o2=mass3o2 / massroot (58)

[0324] con3n2=mass3n2 / massroot (59)

[0325] con3na2o2=mass3na2o2 / massroot (60)

[0326] con3na2o=mass3na2o / massroot (61)

[0327] The bottom average gas specific heat capacity cproot is calculated according to formula (62):

[0328] proot=con3o2*cpo2+con3n2*cpn2+con3na2o2*cpna2o2

[0329] +con2na2o*cpna2o (62)

[0330] The average relative molecular mass of the bottom gas, molroot, is calculated according to formula (63):

[0331] molroot=con3o2*32+con3n2*28+con3na2o2*78

[0332] +con3na2o*62 (63)

[0333] Calculate the bottom gas pressure proot (kPa) according to formula (64):

[0334] proot=massroot*(troot+273.15)*8.314

[0335] *1000 / (vroot*molroot) (64)

[0336] Bottom energy balance process:

[0337] The convective heat transfer qcoef5(j) of the upper gas and the bottom gas is calculated according to formula (65):

[0338] qcoef5=aroot*coef5*(ttop-troot) (65)

[0339] The bottom gas enthalpy hroot (kJ / kg) is calculated according to formula (66):

[0340] hroot=cproot*(273.15+troot) (66)

[0341] The heat absorbed by the bottom gas qroot(j) is calculated according to formula (67):

[0342] qroot=qcoef5+(ttop-troot)*cproot*flu2*dtt

[0343] +(tbottom-troot)*cproot*flu3*dtt

[0344] +(trootin-troot)*cproot*fn2*dtt (67)

[0345] The bottom gas temperature troot (°C) is calculated according to formula (68):

[0346] troot=troot+qroot / (cproot*massroot) (68)

[0347] Related parameter description:

[0348] Fairin: ventilation flow rate flowing into the upper part [kg / s] (externally given)

[0349] vbottom, vtop, vroot: bottom, top, and bottom volume (m 3 )(External setting)

[0350] dtt: reaction time (s) (externally given)

[0351] com: Oxygen fraction consumed to generate sodium peroxide (externally given)

[0352] gsbv: oxygen and sodium combustion reaction factor (externally given)

[0353] agsbv: surface area coefficient of the sodium pool at the bottom of the process room (externally given)

[0354] abottom: lower heat exchange area size (externally given)

[0355] atop: upper heat exchange area size (externally given)

[0356] aroot: bottom heat exchange area size (externally given)

[0357] coef1: Sodium combustion and upper gas space convection heat transfer coefficient (externally given)

[0358] coef2: Sodium combustion and upper gas space radiation heat transfer coefficient (externally given)

[0359] coef3: Convection heat transfer coefficient between the lower gas and upper gas space (externally given)

[0360] coef4: Convection heat transfer coefficient between upper gas space and wall (externally given)

[0361] coef5: Convection heat transfer coefficient of upper gas space and bottom (externally given)

[0362] coefna2o2: The ratio coefficient (0-1) of sodium peroxide generated by the combustion reaction to sodium peroxide aerosol (given externally)

[0363] coefna2o: The ratio coefficient (0-1) of the conversion of sodium oxide generated by the combustion reaction into sodium oxide aerosol (externally given)

[0364] This embodiment adopts the idea of ​​nodeization. Under the spatial model of the sodium process room, the gas space is simplified into three gas space nodes: upper, lower, and bottom. Based on the combustion conditions of the sodium fire and the gas circulation conditions of different gas spaces, the changes in the mass, heat, temperature, and pressure of the upper gas space, the lower gas space, and the bottom gas space are analyzed according to the mass balance principle and the energy balance principle. This can meticulously reflect the changes in temperature and pressure in the process room during the sodium fire combustion process, which meets the requirements for monitoring temperature and pressure parameters in different areas when a sodium fire accident occurs in an actual sodium process room.

[0365] It should be understood that in the above formula, if there are identical parameters on both sides of the equal sign, the identical parameter on the right side of the equal sign represents the value of the parameter at the previous moment, and the identical parameter on the left side of the equal sign represents the value of the parameter at the current moment.

[0366] In addition, due to the development and use of the single-phase sodium flow network of the current rinsim platform, the influence of the physical phenomenon of the sodium fire combustion accident after sodium leakage on the temperature and pressure of the simulation process room is not considered. Therefore, the method of the present embodiment is also based on the rinsim platform (preferably the rinsim2.0 platform) to generate a sodium fire model component (the sodium fire model component is used to simulate the process room where the sodium fire combustion accident occurs), and based on the aforementioned steps, the temperature and pressure changes of the upper gas space, the lower gas space and the bottom gas space in the process room are obtained, and based on the sodium fire model component, the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node are graphically displayed, so that the user can intuitively see the influence of the physical phenomenon of the sodium fire combustion accident on the temperature and pressure of the process room.

[0367] Preferably, the sodium fire model components are developed using the RinSim 2.0 graphical modeling platform in this embodiment, and the code subroutines are developed using Visual Studio 2010. The program code includes a sodium flow interface, an inlet and outlet for simulating the sodium process room ventilation duct, a process room nitrogen interface, and an upper and lower pressure difference interface within the process room.

[0368] The present invention adopts a node-based approach to simulate the temperature and pressure changes in the process room during a sodium fire combustion accident, providing a method that conforms to actual conditions for sodium fire combustion accidents.

[0369] It can be seen that the present invention adopts the idea of ​​nodeization to subdivide the temperature and pressure of different areas between processes during the sodium fire accident combustion process, which can carefully reflect the changes in temperature and pressure between processes during the sodium fire combustion process, and meets the requirements for temperature and pressure monitoring of different areas when a sodium fire accident occurs in an actual sodium process. Under the same initial conditions, the temperature and pressure changes of the containment caused by the pool-type sodium fire and the temperature distribution of the sodium pool surface are calculated. Compared with the calculation results of other international programs, the sodium fire accident combustion model developed by the present invention is more suitable for measuring temperature and pressure measuring points in different areas between actual sodium processes.

[0370] Example 2

[0371] This embodiment provides a sodium fire combustion analysis system, which includes a modeling module, an analysis module, and a display module. Among them, the modeling module is used to construct a spatial model of the process room where sodium fire combustion occurs, and the spatial model is constructed to include a gas space, a wall located at the top of the process room, and a sodium pool located below the flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node and a bottom gas space node, the upper gas space node is adjacent to the wall, the lower gas space node is adjacent to the surface of the flame zone of the sodium fire combustion, and the bottom gas space node is adjacent to the ground of the process room; the analysis module is used to obtain the combustion conditions of the sodium fire combustion based on the chemical reaction mechanism of the sodium fire combustion based on the spatial model, and obtain the gas circulation conditions between the upper gas space node, the lower gas space node and the bottom gas space node, and then obtain the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node based on the mass balance principle and the energy balance principle according to the combustion conditions of the sodium fire combustion and the gas circulation conditions; the display module is used to display the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node.

[0372] In one feasible embodiment, the analysis module obtains the combustion conditions of sodium fire combustion, including: according to the chemical reaction mechanism of sodium fire combustion, calculating the combustion rate of oxygen during sodium fire combustion, the mass of metallic sodium after the sodium fire combustion reaction, the mass of oxygen remaining in the process after the sodium fire combustion reaction, the mass of sodium peroxide generated by the sodium fire combustion reaction, the mass of sodium oxide generated by the sodium fire combustion reaction, the mass of the mixture of sodium and sodium oxide remaining after the sodium fire combustion, the flow rate of sodium peroxide aerosol and sodium oxide aerosol generated by the sodium fire combustion entering the lower gas space node respectively, the temperature of the mixture of sodium and sodium after the sodium fire combustion, the radiation heat exchange between the sodium pool and the lower gas space node during sodium fire combustion, the convection heat exchange between the sodium pool and the lower gas space node, and the molar heat released when sodium fire combustion generates sodium peroxide and sodium oxide.

[0373] In one practicable manner, the analysis module obtains the gas circulation conditions between the upper gas space node, the lower gas space node and the bottom gas space node, including: calculating the flow rate of the lower gas space node flowing into the upper gas space node, the flow rate of the upper gas space node flowing into the bottom gas space node, and the flow rate of the bottom gas space node flowing into the lower gas space node.

[0374] In one practicable manner, the analyzing module obtains the temperature and pressure of the gas at the lower gas space node, including:

[0375] Calculating the lower gas mass corresponding to the lower gas space node according to the mass balance principle, and calculating the lower gas pressure corresponding to the lower gas space node according to the lower gas mass;

[0376] According to the energy balance principle, the heat absorbed by the lower gas corresponding to the lower gas space node is calculated, and the lower gas temperature corresponding to the lower gas space node is calculated based on the lower gas heat.

[0377] In one practicable manner, the analyzing module obtains the temperature and pressure of the gas at the upper gas space node, including:

[0378] Calculating the upper gas mass corresponding to the upper gas space node according to the mass balance principle, and calculating the upper gas pressure corresponding to the upper gas space node according to the upper gas mass;

[0379] According to the energy balance principle, the heat absorbed by the upper gas corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated based on the upper gas heat.

[0380] In one practicable manner, the analyzing module obtains the temperature and pressure of the gas at the bottom gas space node, including:

[0381] Calculating the bottom gas mass corresponding to the bottom gas space node according to the mass balance principle, and calculating the bottom gas pressure corresponding to the bottom gas space node according to the bottom gas mass;

[0382] According to the energy balance principle, the bottom gas absorption heat corresponding to the bottom gas space node is calculated, and the bottom gas temperature corresponding to the bottom gas space node is calculated based on the bottom gas heat.

[0383] In one practicable embodiment, the system is integrated into the Rinsim platform, and the Rinsim platform generates a sodium fire model component to simulate the process room where sodium fire combustion occurs, and graphically displays the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node based on the sodium fire model component.

[0384] The present invention employs a node-based approach to subdivide the temperature and pressure of different regions within a process room during a sodium fire accident. This allows for detailed characterization of temperature and pressure changes within the process room during the sodium fire, meeting the requirements for temperature and pressure monitoring in different regions during a sodium fire accident in an actual sodium process room. Under identical initial conditions, the temperature and pressure changes within the containment vessel caused by a pool-type sodium fire, as well as the temperature distribution on the sodium pool surface, are calculated. Compared to calculations from other international programs, the sodium fire accident combustion model developed by the present invention is more suitable for measuring temperature and pressure points in different regions within an actual sodium process room.

[0385] Example 3

[0386] This embodiment provides an electronic device, which can be expressed in the form of a computing device (for example, a server device), including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the sodium fire combustion analysis method provided in Example 1 can be implemented.

[0387] Figure 3 The hardware structure diagram of this embodiment is shown in FIG. Figure 3 As shown, the electronic device 30 specifically includes:

[0388] At least one processor 31, at least one memory 32, and a bus 33 for connecting different system components (including the processor 31 and the memory 32), wherein:

[0389] The bus 33 includes a data bus, an address bus, and a control bus.

[0390] The memory 32 includes a volatile memory, such as a random access memory (RAM) 321 and / or a cache memory 322 , and may further include a read-only memory (ROM) 323 .

[0391] The memory 32 also includes a program / utility 325 having a set (at least one) of program modules 324, such program modules 324 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0392] The processor 31 executes various functional applications and data processing by running the computer program stored in the memory 32, such as the steps of the sodium fire combustion analysis method provided in Example 1 of the present invention.

[0393] The electronic device 30 can further communicate with one or more external devices 34 (e.g., a keyboard, pointing device, etc.). Such communication can occur via an input / output (I / O) interface 35. Furthermore, the electronic device 30 can communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 36. The network adapter 36 communicates with other modules of the electronic device 30 via a bus 33. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with the electronic device 30, including but not limited to microcode, device drivers, redundant processors, external disk drive arrays, RAID (RAID) systems, tape drives, and data backup storage systems.

[0394] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this division is merely exemplary and not mandatory. In fact, depending on the embodiment of the present application, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0395] Example 4

[0396] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of the sodium fire combustion analysis method provided in Example 1 are implemented.

[0397] The readable storage medium may include, but is not limited to, a portable disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory, an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0398] In a possible embodiment, the present invention can also be implemented in the form of a program product, which includes program code. When the program product is run on an electronic device, the program code is used to enable the electronic device to execute the steps of the sodium fire combustion analysis method provided in Example 1.

[0399] The program code for executing the present invention may be written in any combination of one or more programming languages, and may be executed entirely on the user device, partially on the user device, as an independent software package, partially on the user device and partially on a remote device, or entirely on the remote device.

[0400] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of the present invention.

Claims

1. A sodium fire combustion analysis method, characterized in that: include: Constructing a spatial model of a process room where sodium fire combustion occurs, the spatial model being constructed to include a gas space, a wall located at the top of the process room, and a sodium pool located below the flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node, and a bottom gas space node, wherein the upper gas space node is adjacent to the wall, the lower gas space node is adjacent to the surface of the flame zone of the sodium fire combustion, and the bottom gas space node is adjacent to the floor of the process room; Based on the spatial model, the combustion condition of the sodium fire is obtained according to the chemical reaction mechanism of the sodium fire combustion; Obtaining gas flow conditions between the upper gas space node, the lower gas space node, and the bottom gas space node; According to the combustion conditions of the sodium fire and the gas circulation conditions, the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node are obtained based on the mass balance principle and the energy balance principle; The temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node are displayed.

2. The sodium fire combustion analysis method according to claim 1, characterized in that: The method of obtaining the combustion condition of the sodium fire combustion includes: calculating, based on the chemical reaction mechanism of the sodium fire combustion, the combustion rate of oxygen during the sodium fire combustion, the mass of metallic sodium after the sodium fire combustion reaction, the mass of oxygen remaining in the process room after the sodium fire combustion reaction, the mass of sodium peroxide generated by the sodium fire combustion reaction, the mass of sodium oxide generated by the sodium fire combustion reaction, the mass of the mixture of sodium and sodium oxide remaining after the sodium fire combustion, the flow rates of the sodium peroxide aerosol and the sodium oxide aerosol generated by the sodium fire combustion entering the lower gas space node respectively, the temperature of the mixture of sodium and sodium after the sodium fire combustion, the radiation heat exchange between the sodium pool and the lower gas space node during the sodium fire combustion, the convection heat exchange between the sodium pool and the lower gas space node, and the molar heat released when the sodium fire combustion generates sodium peroxide and sodium oxide.

3. The sodium fire combustion analysis method according to claim 1, characterized in that: The obtaining of the gas circulation conditions among the upper gas space node, the lower gas space node and the bottom gas space node includes: calculating the flow rate of the lower gas space node flowing into the upper gas space node, the flow rate of the upper gas space node flowing into the bottom gas space node, and the flow rate of the bottom gas space node flowing into the lower gas space node.

4. The sodium fire combustion analysis method according to claim 1, characterized in that: The obtaining of the temperature and pressure of the gas at the lower gas space node includes: Calculating the lower gas mass corresponding to the lower gas space node according to the mass balance principle, and calculating the lower gas pressure corresponding to the lower gas space node according to the lower gas mass; According to the energy balance principle, the heat absorbed by the lower gas corresponding to the lower gas space node is calculated, and the lower gas temperature corresponding to the lower gas space node is calculated based on the lower gas heat.

5. The sodium fire combustion analysis method according to claim 1, characterized in that: The obtaining of the temperature and pressure of the gas at the upper gas space node includes: Calculating the upper gas mass corresponding to the upper gas space node according to the mass balance principle, and calculating the upper gas pressure corresponding to the upper gas space node according to the upper gas mass; According to the energy balance principle, the heat absorbed by the upper gas corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated based on the upper gas heat.

6. The sodium fire combustion analysis method according to claim 1, characterized in that: The obtaining of the temperature and pressure of the gas at the bottom gas space node includes: Calculating the bottom gas mass corresponding to the bottom gas space node according to the mass balance principle, and calculating the bottom gas pressure corresponding to the bottom gas space node according to the bottom gas mass; According to the energy balance principle, the bottom gas absorption heat corresponding to the bottom gas space node is calculated, and the bottom gas temperature corresponding to the bottom gas space node is calculated based on the bottom gas heat.

7. The sodium fire combustion analysis method according to claim 1, characterized in that: The method further includes: generating a sodium fire model component based on a Rinsim platform, wherein the sodium fire model component is used to simulate a process room where sodium fire combustion occurs; The displaying of the temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node includes: The temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node are graphically displayed based on the sodium fire model component.

8. A sodium fire combustion analysis system, characterized in that: include: a modeling module for constructing a spatial model of a process room where sodium fire combustion occurs, the spatial model being constructed to include a gas space, a wall located at a top of the process room, and a sodium pool located below a flame zone of the sodium fire combustion, wherein the gas space is simplified to include an upper gas space node, a lower gas space node, and a bottom gas space node, the upper gas space node being adjacent to the wall, the lower gas space node being adjacent to a surface of the flame zone of the sodium fire combustion, and the bottom gas space node being adjacent to a floor of the process room; an analysis module for obtaining, based on the spatial model and according to the chemical reaction mechanism of sodium fire combustion, a combustion condition of the sodium fire combustion, and obtaining a gas circulation condition between the upper gas space node, the lower gas space node, and the bottom gas space node; and then obtaining, based on the mass balance principle and the energy balance principle, a temperature and pressure of the gas at the upper gas space node, the lower gas space node, and the bottom gas space node according to the combustion condition of the sodium fire combustion and the gas circulation condition; The display module is used to display the temperature and pressure of the gas at the upper gas space node, the lower gas space node and the bottom gas space node.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the sodium fire combustion analysis according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the sodium fire combustion analysis according to any one of claims 1 to 7 are implemented.

Images