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

Abstract

The invention provides a sodium fire combustion analysis method and system, electronic equipment and a storage medium, and the method comprises the steps: constructing a space model of a process room where sodium fire combustion occurs, and the space model is constructed to comprise a gas space, a wall surface located at the top of the process room and a sodium pool located below a flame region of sodium fire combustion, the gas space is simplified to comprise 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 surface, the lower gas space node is adjacent to the surface of a flame area of sodium fire combustion, and the bottom gas space node is adjacent to the ground of the process room; according to the combustion condition of sodium fire combustion and the gas circulation condition, the temperature and pressure of 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. According to the method, the influence of sodium fire combustion accidents on different areas in the process can be obtained.

Description

Technical Field

[0001] The 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 mainly used to train nuclear power plant operators, optimize and verify designs, and verify technical transformation. The Rinsim platform is an integrated simulation platform for nuclear power plants, and a full-life support platform for the development of nuclear power plant and nuclear power simulation systems.

[0003] At present, in the development and use of the single-phase sodium flow network of the Rinsim platform, the impact of the physical phenomenon of sodium fire combustion accidents after sodium leakage on the temperature and pressure of the process room has not been considered. Sodium fire combustion (also known as sodium fire reaction) is a unique accident of sodium-cooled fast reactors. When coolant sodium leaks into the process room in the loop, it will burn when it encounters oxygen. The high-speed ejected sodium usually forms a spray sodium fire, and the incompletely burned sodium will fall to the ground to form a sodium pool. Safety issues related to sodium fire combustion often need to be highly valued.

[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 of 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 a sodium fire combustion accident on different areas of a 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 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 surface of the flame zone of the sodium fire combustion, and the bottom gas space node being adjacent to the ground of the process room;

[0009] Based on the spatial model, the combustion conditions of the sodium fire combustion are 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 method of obtaining the combustion condition of sodium fire combustion includes: calculating, according to the chemical reaction mechanism of sodium fire combustion, 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 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 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.

[0014] Furthermore, 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.

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

[0016] According to the mass balance principle, the lower gas mass corresponding to the lower gas space node is calculated, and the lower gas pressure corresponding to the lower gas space node is calculated 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] Further, the obtaining of the temperature and pressure of the gas at the upper gas space node includes:

[0019] According to the mass balance principle, the upper gas mass corresponding to the upper gas space node is calculated, and the upper gas pressure corresponding to the upper gas space node is calculated according to the upper gas mass;

[0020] According to the energy balance principle, the upper gas absorption heat corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated according to the upper gas heat.

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

[0022] According to the mass balance principle, the bottom gas mass corresponding to the bottom gas space node is calculated, and the bottom gas pressure corresponding to the bottom gas space node is calculated 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 according to the bottom gas heat.

[0024] Further, 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 comprises:

[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 surface located at the top of the process room, and a sodium pool located below a flame zone of 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 a surface of the flame zone of sodium fire combustion, and the bottom gas space node being adjacent to the ground of the process room;

[0029] An analysis module, for obtaining the combustion conditions of the sodium fire combustion based on the space model and the chemical reaction mechanism of the sodium fire combustion, and obtaining the gas circulation conditions between the upper gas space node, the lower gas space node and the bottom gas space node, and then 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 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;

[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 of upper, lower and bottom. Based on the combustion conditions of the sodium fire combustion and the gas flow 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 of 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 This is a flow chart of the sodium fire combustion analysis method according to Example 1 of the present invention;

[0035] Figure 2 is a schematic diagram of a 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 scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the" and "the" used in the present disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

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

[0040] flu1: flow rate (kg / s) from the lower gas space node (can be referred to as the upper gas space, upper space, upper part) to the upper gas space node (can be referred to as the lower gas space, lower space, 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 into 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 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 substance concentration (%)

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

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

[0054] con2n2: Upper nitrogen concentration (%)

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

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

[0057] con3o2: Bottom oxygen concentration (%)

[0058] con3n2: Bottom nitrogen concentration (%)

[0059] con3na2o2: Bottom aerosol sodium peroxide aerosol substance 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: lower gas pressure (kpa)

[0070] ptop: upper gas pressure (kpa)

[0071] proot: bottom gas pressure (kpa)

[0072] tbottom: lower 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 the combustion reaction (℃)

[0077] tamt: ambient temperature 20 (℃)

[0078] ttopin: Temperature of the upper inflow 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 the 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: the 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: the 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, bottom volume size (m 3 )

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

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

[0111] abottom: The size of the lower heat exchange area (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: Convective heat transfer coefficient between upper gas space and wall

[0118] coef5: Convection heat transfer coefficient between 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 from lower part to upper part

[0125] kcoe2: flow from top to bottom

[0126] kcoe3: bottom to lower flow 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 gas and upper gas

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

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

[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 dissipation of 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 will catch fire in an oxygen-containing environment and form various oxides. However, there are mainly two oxides, namely 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 catches fire, flames and thick white smoke are generated. Not all the burning sodium forms smoke, and most of the sodium still exists in the form of oxides and unreacted sodium. The remaining reaction products and smoke contain Na2O and Na2O2. In the case of excess oxygen, Na2O2 is the main reaction product; in the case of excess sodium, Na2O is the main reaction product.

[0144] When the pipeline that circulates sodium breaks, the sodium in the pipeline leaks into the room of the sodium process room. When there is oxygen in the sodium process room, a chemical reaction of sodium ignition will occur, releasing heat. The released heat will cause the temperature of the sodium pool and the temperature and pressure of the sodium process room to rise. When the sodium fire combustion reaction occurs, the oxygen in the gas space below that contacts the sodium pool first provides oxygen for the ignition conditions of the sodium fire reaction, so the sodium fire reaction mainly consumes oxygen in the lower gas space. As the reaction proceeds, flame radiation, gas circulation and convection heat transfer occur, and the gas composition and oxygen concentration in the entire sodium process room will change.

[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 comprises the following steps:

[0146] S1, construct a 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 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 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 meet 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 close to 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 the sodium fire combustion process, the mass conservation process is: part of the oxygen consumed by the sodium fire combustion is converted into flue gas Na2O and Na2O2 and enters the lower gas space, and the other part is converted into solid particles of combustion products and remains on the surface of the sodium pool. The lower gas space will be slightly higher than the upper gas space and the bottom gas space due to the initial temperature rise and the entry of flue gas, and the oxygen consumption in the bottom gas space will also be lower than the pressure of the lower gas space. Therefore, the gas in the lower gas space flows into the upper gas space and the bottom gas space respectively.

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

[0151] S3, obtaining the 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 combustion 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 by the following 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) Calculate the mass of metallic sodium after the sodium fire combustion reaction according to formula (2):

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

[0160] -burn*(1-com)*2.875 (2) Calculate the remaining oxygen mass masso2 in the process room after the sodium fire combustion reaction according to the following formula (3):

[0161] masso2=mass1o2+mass2o2+mass3o2-burn*dtt (3) Calculate the mass of sodium peroxide massna2o2 (kg) generated by the sodium fire combustion reaction according to formula (4):

[0162] massna2o2=massna2o2+burn*com*2.435 (4) Calculate the mass of sodium oxide massna2o (kg) generated by the sodium fire combustion reaction according to formula (5):

[0163] massna2o=massna2o+burn*(1-com)*3.875 (5) Calculate the mass of the mixture of remaining sodium and sodium oxides 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 when sodium is burned (including the mass of sodium peroxide mass Na2O2 and the mass of sodium oxide mass Na2O) is calculated according to the following 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 according to the following formula (12):

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

[0176] The convective heat transfer qcoef1 of 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 according to 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 lower, upper and bottom spaces (m 3 )(External setting)

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

[0185] com: The 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 bottom sodium pool in the process room (externally given)

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

[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: Convective heat transfer coefficient of lower gas and upper gas space (externally given)

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

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

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

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

[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 by the following 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 the following formula (17):

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

[0203] The flow rate flu3 from the bottom to the lower gas space is calculated according to the following 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 lower gas absorption heat 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 the following 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 by the following 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 mass1Na2O (kg) generated by the sodium fire reaction and entering the lower space is calculated by formula (22):

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

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

[0223] The lower gas mass massbottom (kg) is calculated 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) Calculate the lower gas pressure pbottom (kPa) according to the following 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 the following 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 the following 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 (℃) is calculated according to the following formula (35):

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

[0245] Related parameter description:

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

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

[0248] com: The 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 bottom sodium pool in the process room (externally given)

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

[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 of lower gas and upper gas space (externally given)

[0257] coef4: Convective 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 the sodium peroxide generated by the combustion reaction to the sodium peroxide aerosol (given externally)

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

[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 absorption 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] The upper oxygen mass mass2o2 (kg) is calculated according to formula (36):

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

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

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

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

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

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

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

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

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

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

[0274] con2o2=mass2o2 / masstop (41)

[0275] con2n2=mass2n2 / masstop (42)

[0276] con2na2o2=mass2na2o2 / masstop (43)

[0277] con2na2o=mass2na2o / masstop (44) Calculate the upper average gas specific heat capacity cptop 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 the following formula (46):

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

[0281] +con2na2o*62 (46) Calculate the upper gas pressure ptop (kPa) 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 the following 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 the following formula (49):

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

[0287] htop=cptop*(273.15+ttop) (50) The upper gas absorption heat qtop(j) is calculated according to the following 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 the following formula (52):

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

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

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

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

[0297] com: The 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 bottom sodium pool in the process room (externally given)

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

[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 of lower gas and upper gas space (externally given)

[0306] coef4: Convective 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 the sodium peroxide generated by the combustion reaction to the sodium peroxide aerosol (given externally)

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

[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 absorption 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] The bottom oxygen gas mass mass3o2 (kg) is calculated according to formula (53):

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

[0314] -con3o2*flu3*dtt-burn*dtt (53) The bottom nitrogen gas mass3n2 (kg) is calculated according to the following 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) The bottom gas mass massroot (kg) is calculated 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] The bottom gas pressure proot (kPa) is calculated 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 of the upper gas and the bottom gas qcoef5(j) is calculated according to the following 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 bottom gas absorption heat 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 the following 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, bottom volume size (m 3 )(External setting)

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

[0351] com: The 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 bottom sodium pool in the process room (externally given)

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

[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 of lower gas and upper gas space (externally given)

[0360] coef4: Convective 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 the sodium peroxide generated by the combustion reaction to the sodium peroxide aerosol (given externally)

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

[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 sodium fire combustion and the gas circulation conditions of different gas spaces, the changes in 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 the same parameters on both sides of the equal sign, the same parameter on the right side of the equal sign represents the value of the parameter at the previous moment, and the same 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 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 also generates a sodium fire model component based on the rinsim platform (preferably the rinsim2.0 platform) (the sodium fire model component is used to simulate the process room where the sodium fire combustion accident occurs), and obtains the temperature and pressure changes of the upper gas space, the lower gas space and the bottom gas space in the process room based on the aforementioned steps, and 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, 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 present embodiment uses the Rinsim2.0 graphical modeling platform to develop the sodium fire model component, and the code subroutine is developed using Visual Studio 2010. In the program code, a sodium flow interface, an inlet and outlet of the simulated sodium process room ventilation duct, a process room nitrogen interface, and an upper and lower pressure difference interface in the process room are introduced.

[0368] The present invention adopts a node-based concept to simulate the temperature and pressure changes in the process room during a sodium fire combustion accident, and provides a method that conforms to the actual situation 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 monitoring the temperature and pressure of different areas when a sodium fire accident occurs in the 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 on the surface of the sodium pool 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 the measurement of temperature and pressure measuring points in different areas of the actual sodium process.

[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 condition 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 condition between the upper gas space node, the lower gas space node and the bottom gas space node, and then according to the combustion condition of the sodium fire combustion and the gas circulation condition, 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 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 practicable manner, 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 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 remaining sodium and sodium oxide after sodium fire combustion, the flow rates of sodium peroxide aerosol and sodium oxide aerosol generated by sodium fire combustion entering the lower gas space node respectively, the temperature of the mixture of sodium and sodium after 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 an practicable manner, the analysis module obtains the temperature and pressure of the gas at the lower gas space node, including:

[0375] According to the mass balance principle, the lower gas mass corresponding to the lower gas space node is calculated, and the lower gas pressure corresponding to the lower gas space node is calculated 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 an practicable manner, the analysis module obtains the temperature and pressure of the gas at the upper gas space node, including:

[0378] According to the mass balance principle, the upper gas mass corresponding to the upper gas space node is calculated, and the upper gas pressure corresponding to the upper gas space node is calculated according to the upper gas mass;

[0379] According to the energy balance principle, the upper gas absorption heat corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated according to the upper gas heat.

[0380] In an operative manner, the analysis module obtains the temperature and pressure of the gas at the bottom gas space node, including:

[0381] According to the mass balance principle, the bottom gas mass corresponding to the bottom gas space node is calculated, and the bottom gas pressure corresponding to the bottom gas space node is calculated 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 according to the bottom gas heat.

[0383] In one practicable embodiment, the system is integrated into a Rinsim platform, and the Rinsim platform generates a sodium fire model component to simulate a 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 adopts the idea of ​​nodeization to subdivide the temperature and pressure of different areas in the process room 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 monitoring the temperature and pressure of different areas when a sodium fire accident occurs in an actual sodium process room. Under the same initial conditions, the temperature and pressure changes of the containment caused by the pool-type sodium fire and the temperature distribution on the surface of the sodium pool 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 the temperature and pressure measuring points of different areas in the 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 the steps of the sodium fire combustion analysis method provided in Embodiment 1 can be implemented when the processor executes the computer program.

[0387] Figure 3 FIG. 4 shows a schematic diagram of the hardware structure of this embodiment. 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., keyboards, pointing devices, etc.). Such communication can be performed through an input / output (I / O) interface 35. In addition, the electronic device 30 can also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) through a network adapter 36. The network adapter 36 communicates with other modules of the electronic device 30 through the bus 33. It should be understood that, although not shown in the figure, 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 (disk array) 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, according to the embodiments 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 into multiple units / modules to be embodied.

[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 Embodiment 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 of the above.

[0398] In a possible implementation manner, the present invention can also be implemented in the form of a program product, which includes a 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 a user device, partially on a user device, as an independent software package, partially on a user device and partially on a remote device, or entirely on a remote device.

[0400] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection 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, but these changes and modifications all fall within the protection 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 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 surface of the flame zone of the sodium fire combustion, and the bottom gas space node being adjacent to the ground of the process room; Based on the spatial model, the combustion conditions of the sodium fire combustion are 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 for obtaining the combustion condition of sodium fire combustion comprises: calculating, according to the chemical reaction mechanism of sodium fire combustion, 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 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 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 peroxide and sodium oxide are generated by sodium fire combustion.

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 comprises: According to the mass balance principle, the lower gas mass corresponding to the lower gas space node is calculated, and the lower gas pressure corresponding to the lower gas space node is calculated 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 comprises: According to the mass balance principle, the upper gas mass corresponding to the upper gas space node is calculated, and the upper gas pressure corresponding to the upper gas space node is calculated according to the upper gas mass; According to the energy balance principle, the upper gas absorption heat corresponding to the upper gas space node is calculated, and the upper gas temperature corresponding to the upper gas space node is calculated according to 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 comprises: According to the mass balance principle, the bottom gas mass corresponding to the bottom gas space node is calculated, and the bottom gas pressure corresponding to the bottom gas space node is calculated 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 according to 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 comprises: 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 surface located at the top of the process room, and a sodium pool located below a flame zone of 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 a surface of the flame zone of sodium fire combustion, and the bottom gas space node being adjacent to the ground of the process room; An analysis module, for obtaining the combustion conditions of the sodium fire combustion based on the space model and the chemical reaction mechanism of the sodium fire combustion, and obtaining the gas circulation conditions between the upper gas space node, the lower gas space node and the bottom gas space node, and then 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 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.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: 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.

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