CN112614604A - Pulse extraction column organic phase ignition accident source item estimation method - Google Patents

Pulse extraction column organic phase ignition accident source item estimation method Download PDF

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CN112614604A
CN112614604A CN202011346187.2A CN202011346187A CN112614604A CN 112614604 A CN112614604 A CN 112614604A CN 202011346187 A CN202011346187 A CN 202011346187A CN 112614604 A CN112614604 A CN 112614604A
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mass
smoke
extraction column
time step
fuel
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CN112614604B (en
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梁博宁
张建岗
杨亚鹏
王任泽
冯宗洋
贾林胜
王宁
刘一宁
闫峰
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China Institute for Radiation Protection
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China Institute for Radiation Protection
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/007—Recovery of isotopes from radioactive waste, e.g. fission products
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The invention relates to a method for estimating an organic phase fire accident source item of a pulse extraction column, which comprises the following steps: (1) starting; (2) acquiring process parameters; (3) estimating the mass of the solvent leaked at present and the surface area of the combustion pool; (4) calculating the mass of the x-th smoke generated by fuel combustion; (5) calculating the residual mass of the xth flue gas after the flue gas is filtered by a filter and is settled by a pipeline; (6) calculating the activity of the released xth smoke and the total release activity of all kinds of smoke after the smoke is filtered by a filter and is settled by a pipeline; (7) estimating the residual oxygen content, and returning to the step (4) for re-estimation; (8) if the fuel is burned out, the calculation ends. According to the method, a reasonable estimation method is provided by analyzing the environmental characteristics and available state parameters of a pulse extraction column in a spent fuel post-treatment facility and based on the ignition rule of an organic phase (tributyl phosphate-kerosene mixed solution) of the pulse extraction column, and input conditions are provided for emergency response and emergency decision.

Description

Pulse extraction column organic phase ignition accident source item estimation method
Technical Field
The invention belongs to the technical field of nuclear and radiation emergency, and particularly relates to a pulse extraction column organic phase fire accident source item estimation method.
Background
When nuclear fuel is used in a reactor, the consumption of fissile nuclides and the generation of fission products and heavy nuclides cause the change of fuel reactivity, and finally the reactor can not maintain criticality any more, so that the nuclear fuel needs to be replaced to a certain extent. The fuel discharged after irradiation by the reactor is also called spent fuel or irradiated fuel. Spent nuclear fuel must be properly disposed of because it contains a large amount of radionuclides and is therefore highly radioactive. The spent fuel treatment mainly comprises the processes of storage, transportation, post-treatment, deep geological disposal and the like.
Spent fuel reprocessing is an important link for realizing the recycling and proper disposal of nuclear fuel. The Purex process (Purex) is a chemical process for recovering uranium and plutonium from irradiated nuclear fuel by tributyl phosphate extraction, and is the most effective and successful post-treatment process nowadays. A solvent extraction system, a solvent purification system and an equipment room in a spent fuel post-treatment facility contain a large amount of organic solvents, and potential fire accident potential of organic phase solvents exists. In the uranium and plutonium co-decontamination system, the position with the highest radioactive activity concentration of fission products is a pulse extraction column, the quantity of radioactive nuclides released from a burning solvent is the largest when solvent leakage catches fire in the device, and the main burning substance is a mixed solution of tributyl phosphate and kerosene. In the nuclear emergency condition, the source item estimation needs to be carried out on the accident so as to provide input conditions for emergency response and emergency decision.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a pulse extraction column organic phase ignition accident source item estimation method, which provides a reasonable estimation method based on the ignition rule of a pulse extraction column organic phase (tributyl phosphate-kerosene mixed solution) by analyzing the environmental characteristics and available state parameters of the pulse extraction column in a spent fuel post-treatment facility, and provides input conditions for emergency response and emergency decision.
In order to achieve the above purposes, the invention adopts a technical scheme that: a method for estimating the source term of an organic phase fire accident of a pulse extraction column comprises the following steps:
(1) judging whether the pulse extraction column has a fire accident or not, and starting calculation if the pulse extraction column has the fire accident;
(2) acquiring process parameters;
(3) estimating the mass M of the solvent leaked at present according to the data of the pulse extraction column quality on-line monitoring device and the sump liquid level alarm devicef,0And the surface area S of the combustion chamberpool；
(4) Calculating the x-th smoke mass m generated by fuel combustion at the current time stepx,a,t；
(5) Calculating the residual mass m of the x-th smoke filtered by the filter of the exhaust pipeline and settled by the pipeline at the current time stepx,a,t,J；
(6) Calculating the activity A of the released x type of smoke at the current time step after the smoke is filtered by a filter of the exhaust pipeline and is settled by the pipelinex,tAnd the total release activity A of all kinds of smoke at the current time stept；
(7) Judging whether the fuel is burnt out or not, if not, calculating the mass of the residual available oxygen in the equipment room at the current time step
Figure BDA0002799996210000021
And initial available oxygen mass
Figure BDA0002799996210000022
Returning to the step (4) for recalculation;
(8) and if the fuel is burnt out, calculating the total activity A of the organic phase ignition release at all time steps, and finishing the calculation.
Further, one embodiment of the step (1) is to manually start the calculation.
Further, another embodiment in step (1) is to automatically start the calculation by detecting the occurrence of combustion in the pulsed extraction column through drift behavior of the process monitoring instrument and the increase of radioactivity of the aerosol in the equipment room.
Further, the process parameters in the step (2) include fixed process parameters, real-time process parameters and real-time monitoring parameters.
Further, the fixed process parameters comprise the height of the equipment room and the volume of the equipment room, the real-time process parameters comprise the volume fraction of tributyl phosphate and the initial mass of the organic solvent of the pulse extraction column in the current process flow, and the real-time monitoring parameters comprise the inlet air flow and the outlet air flow of the equipment room.
Further, the mass M of the solvent currently leaked in the step (3)f,0And the surface area S of the combustion chamberpoolThe calculation method comprises the following steps:
Mf,0＝Mo-Ml
Figure BDA0002799996210000031
wherein M is0Is the initial mass of the organic solvent of the pulsed extraction column of the current process flow, M1Is the current residual organic solvent mass of the pulse extraction column, rhofIs the density of the organic solvent, HpoolIs the height of the combustion chamber.
Further, the specific steps of the step (4) include:
(41) calculating the fuel mass loss rate m't
Figure BDA0002799996210000032
Where t is the current time step, hcFor combustion convection heat flux density, hfFor combustion of radiant heat flux, hrIs the surface radiant heat flux, hlFor latent heat of vaporization of fuel, TtFor the solution temperature at the current time step, cf(Tt) Is the heat capacity of the fuel, TbIs the boiling point of the fuel, T∞In order to be at an infinite space temperature,
Figure BDA0002799996210000033
is the mass ratio of nitrate solution;
(42) calculating the fuel combustion mass m at the current time steptWith the mass of oxygen consumed by combustion of the fuel
Figure BDA0002799996210000034
mt＝m"t·Δt·Spool
Figure BDA0002799996210000035
Wherein, Δ t is the current time step duration,
Figure BDA0002799996210000036
mass of oxygen consumed for combustion of a unit mass of fuel;
(43) calculating the total heat quantity Q generated by combustiontAnd the solution temperature T of the next time stept+1
Qt＝amtht
Figure BDA0002799996210000037
Wherein a is the heat release efficiency, htAs heat of combustion of fuel, MroomIs an equipment roomAll equipment masses (including iron on the ground, wall, etc.), cs(Tt) The heat capacity of steel is adopted;
(44) calculating mass fraction omega of fuel combustion at the current time stept
Figure BDA0002799996210000041
Wherein M isf,tThe initial remaining fuel mass for the current time step,
mass of oxygen consumed by fuel combustion if current time step
Figure BDA0002799996210000042
Greater than the current remaining available oxygen mass
Figure 100002_1
The mass of oxygen consumed by the fuel burning at the current time step
Figure BDA0002799996210000044
Equal to the current remaining available oxygen mass
Figure 100002_2
Namely, it is
Figure BDA0002799996210000046
(45) Calculating the x-th smoke mass m generated at the current time stepx,a,t，
mx,a,t＝Mx,t·ωt·γx
Wherein M isx,tFor the remaining mass of the x-th radionuclide, gamma, at the current time stepxThe smoke generation rate for the x-th radionuclide.
Further, the specific steps of the step (5) include:
(51) calculating the residual smoke mass of the smoke before the smoke passes through the jth filter
Figure BDA0002799996210000047
Figure BDA0002799996210000048
Wherein m isx,a,t,j-1The mass of the residual smoke, zeta, of the xth smoke after passing through the jth-1 filterx,jThe deposition rate per unit path of the x type flue gas in the j section of the pipeline, ljIs the length of the pipe before the jth filter;
(52) calculating the x-th smoke mass Deltam filtered by the jth filterx,a,t,j
Figure BDA0002799996210000049
Wherein the content of the first and second substances,
Figure BDA00027999962100000410
the filtering efficiency of the jth filter on the xth type of smoke;
(53) calculating the residual smoke mass m after passing through the jth filterx,a,t,j
Figure BDA0002799996210000051
Wherein, ω isxIs the mass fraction of the x-th radionuclide in the oxide fume;
(54) calculating the effective filter mass m remaining for the jth filterp,t,j
Figure BDA0002799996210000052
Wherein m isp,t-1,jTo provide the effective filtering quality remaining for the time step preceding the jth filter,
Figure BDA0002799996210000053
all flue gases filtered for jth filterQuality;
if the filter has a remaining effective filter mass mp,t,jThe mass of the filtered smoke is less than or equal to the mass of the filtered smoke, and the mass of the filtered smoke is set as the residual effective filtering mass m of the filterp,t,jAnd the filter is failed;
(55) after filtering by J filters and pipeline sedimentation, the residual mass of the x-th smoke at the current time step is mx,a,t,J。
Further, the activity A released by the xth smoke in the current time step in the step (6)x,tAnd the total release activity A of all kinds of smoke at the current time steptThe calculation method comprises the following steps:
Ax,t＝axmx,a,t,J
Figure BDA0002799996210000054
wherein, axThe specific activity of the X-th radionuclide is more than or equal to 1 and less than or equal to X.
Further, the quality of the oxygen remaining available in the equipment room at the current time step in the step (7)
Figure BDA0002799996210000055
And initial available oxygen mass
Figure BDA0002799996210000056
The calculation method comprises the following steps:
for organic solvents, when the oxygen content in the air reaches eta, the organic solvents cannot be combusted, so that the oxygen content of the exhausted air is assumed to be eta,
Figure BDA0002799996210000057
Figure BDA0002799996210000058
wherein the content of the first and second substances,
Figure BDA0002799996210000061
for the quality of the residual available oxygen in the equipment room at the previous time step, VinIs the inlet air flow, ρinIs the intake density, VroomIs the equipment room air volume.
Further, the method for calculating the total activity a of the organic phase released on fire in the step (8) comprises the following steps:
Figure BDA0002799996210000062
wherein t is more than 0 and less than or equal to tt,ttThe total time for the organic phase to ignite and burn is shown.
The invention has the beneficial effects that: the method provides a reasonable estimation method by analyzing the environmental characteristics and available state parameters of a pulse extraction column in the spent fuel post-treatment facility and based on the ignition rule of an organic phase (tributyl phosphate-kerosene mixed solution) of the pulse extraction column, and provides input conditions for emergency response and emergency decision.
Drawings
FIG. 1 is a flow chart of a method for estimating the source of an organic phase fire accident in a pulsed extraction column according to the present invention.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
FIG. 1 is a flow chart of a method for estimating the source of an organic phase fire accident in a pulsed extraction column according to the present invention, the method comprising the following steps:
(1) and judging whether the pulse extraction column has a fire accident or not, and starting calculation if the fire accident occurs.
In the starting module, no interface function is used, and the starting module is started by manual starting or by detecting that the pulse extraction column is burnt through the drifting behavior (pulse extraction column quality and sump liquid level alarm device) of a process monitoring instrument and the radioactive rising phenomenon of the aerosol in the equipment room.
(2) Obtaining process parameters
The acquired process parameters mainly comprise fixed process parameters, real-time process parameters and real-time monitoring parameters.
The fixed process parameters comprise the height of the equipment chamber, the volume of the equipment chamber and the like, the real-time process parameters comprise the volume fraction of tributyl phosphate, the initial mass of the organic solvent of the pulse extraction column in the current process flow and the like, and the real-time monitoring parameters comprise the inlet air flow, the outlet air flow and the like of the equipment chamber.
(3) Estimating the mass M of the solvent leaked at present according to the data of the pulse extraction column quality on-line monitoring device and the sump liquid level alarm devicef,0(i.e., initial mass of fuel) and combustion bowl surface area SpoolThe calculation method comprises the following steps:
Mf,0＝Mo-Ml
Figure BDA0002799996210000071
wherein the content of the first and second substances,
M0the initial mass of the organic solvent of the pulse extraction column in the current process flow is Kg;
M1the unit is Kg, which is the mass of the current residual organic solvent of the pulse extraction column;
ρfis the density of the organic solvent and has the unit of Kg/m3；
HpoolIs the height of the combustion chamber in m.
(4) Calculating the x-th smoke mass m generated by fuel combustion at the current time stepx,a,tThe method comprises the following specific steps:
(41) first combining the heat balance formula with combustionThe fuel mass loss rate m' is calculated by empirical rate formula and approximately considering the influence of the nitric acid solution on the combustion rate "tThe calculation method comprises the following steps:
Figure BDA0002799996210000072
wherein the content of the first and second substances,
t is the current time step and is dimensionless;
hcfor combustion convective heat flow density, in Kw/m2；
hfThe density of heat flow of combustion radiation is given in Kw/m2；
hrIs the surface radiant heat flux density in Kw/m2；
hlThe unit is Kj/Kg, which is the latent heat of fuel evaporation;
Ttthe solution temperature at the current time step is given in units of ℃;
cf(Tt) The heat capacity of the fuel is Kj/(Kg. DEG C);
Tbis the fuel boiling point, in units of ℃;
T∞is an infinite space temperature in units of;
Figure BDA0002799996210000081
is the mass ratio of the nitrate solution and has no dimension.
(42) The fuel combustion quality m at the current time step can be obtainedtWith the mass of oxygen consumed by combustion of the fuel
Figure BDA0002799996210000082
The calculation method comprises the following steps:
mt＝mt"·Δt·Spool
Figure BDA0002799996210000083
wherein the content of the first and second substances,
delta t is the duration of the current time step, and the unit is s;
Figure BDA0002799996210000084
is the mass of oxygen consumed by the combustion of unit mass of fuel, and has no dimension;
(43) the total heat quantity Q generated by combustiontAnd the solution temperature T of the next time stept+1Comprises the following steps:
Qt＝amtht
Figure BDA0002799996210000085
wherein the content of the first and second substances,
a is the heat release efficiency, and is dimensionless;
htthe unit is Kj/Kg as the combustion heat of the fuel;
Mroomthe unit is Kg, which is the mass (including iron on the ground, wall and the like) of all equipment in the equipment room;
cs(Tt) The heat capacity of the steel is Kj/(Kg. DEG C);
(44) the mass fraction omega of the fuel combustion at the current time step can be obtainedtComprises the following steps:
Figure BDA0002799996210000086
wherein M isf,tThe initial residual fuel mass in Kg at the current time step;
mass of oxygen consumed by fuel combustion if current time step
Figure BDA0002799996210000087
Greater than the current remaining available oxygen mass
Figure 3
The fuel combustion at the current time step is eliminatedMass of oxygen consumed
Figure BDA0002799996210000089
Equal to the current remaining available oxygen mass
Figure 4
Namely, it is
Figure BDA00027999962100000811
(45) Calculating the x-th smoke mass m generated at the current time stepx,a,t
The smoke generated by X radioactive substances and the smoke generated by an organic solvent are shared, wherein the X +1 term is the smoke generated by solvent combustion, the smoke has no radioactivity, and the mass m of the X smoke generated by the current time stepx,a,tComprises the following steps:
mx,a,t＝Mx,t·ωt·γx
wherein the content of the first and second substances,
Mx,tthe residual mass of the x-th radionuclide in the current time step is Kg;
γxthe smoke generation rate of the x-th radionuclide is dimensionless.
(5) Calculating the residual mass m of the x-th smoke filtered by the filter of the exhaust pipeline and settled by the pipeline at the current time stepx,a,t,J
Since a large amount of flue gas generated by combustion is discharged from the exhaust duct, the duct has a filter, and a part of the flue gas is deposited on the filter, it is necessary to estimate the deposition in the duct and the filter. In addition, the flue gas may cause clogging of the filter, and therefore an evaluation of the filter is also required. The method comprises the following specific steps:
(51) firstly, the residual smoke mass of the smoke before passing through the jth filter is calculated
Figure BDA0002799996210000091
Figure BDA0002799996210000092
Wherein the content of the first and second substances,
mx,a,t,j-1the unit is Kg, which is the mass of the smoke left after the xth smoke passes through the jth-1 filter;
ζx,jthe deposition rate of the x type flue gas in the j section of the pipeline per unit path is m-1；
ljThe length of the pipeline before the jth filter is m;
(52) calculating the x-th smoke mass Deltam filtered by the jth filterx,a,t,j
Figure BDA0002799996210000093
Wherein the content of the first and second substances,
Figure BDA0002799996210000094
the filter efficiency of the jth filter to the xth type smoke is dimensionless;
(53) calculating the residual smoke mass m after passing through the jth filterx,a,t,j
Figure BDA0002799996210000095
Wherein, ω isxIs the mass fraction of the x-th radionuclide in the oxide smoke, and is dimensionless;
(54) calculating the effective filter mass m remaining for the jth filterp,t,j
Figure BDA0002799996210000101
Wherein m isp,t-1,jIs the remaining effective filtration mass in Kg for the previous time step of the jth filter;
Figure BDA0002799996210000102
is the jth processThe unit of the mass of all the smoke filtered by the filter is Kg;
if the filter has a remaining effective filter mass mp,t,jThe mass of the filtered smoke is less than or equal to the mass of the filtered smoke, and the mass of the filtered smoke is set as the residual effective filtering mass m of the filterp,t,jAnd the filter fails.
After filtering by J filters and pipeline sedimentation, the residual mass of the x-th smoke at the current time step is mx,a,t,J。
(6) Calculating the activity A of the released x type of smoke at the current time step after the smoke is filtered by a filter of the exhaust pipeline and is settled by the pipelinex,tAnd the total release activity A of all kinds of smoke at the current time steptThe calculation method comprises the following steps:
Ax,t＝axmx,a,t,J
Figure BDA0002799996210000103
wherein X is more than or equal to 1 and less than or equal to X, axThe radioactivity of the x type radionuclide is expressed in Bq/Kg;
(7) judging whether the fuel is burnt out or not, if not, calculating the mass of the residual available oxygen in the equipment room at the current time step
Figure BDA0002799996210000104
And initial available oxygen mass
Figure BDA0002799996210000105
And (5) returning to the step (4) for recalculation.
For organic solvents, the organic solvent cannot be combusted when the oxygen content in the air reaches eta, so that the mass of the residual available oxygen in the equipment room at the current time step is the mass of the residual available oxygen in the equipment room at the current time step on the assumption that the oxygen content of the exhausted air is eta
Figure 5
And initial available oxygen mass
Figure BDA0002799996210000107
Comprises the following steps:
Figure BDA0002799996210000108
Figure BDA0002799996210000109
wherein the content of the first and second substances,
Figure BDA0002799996210000111
the mass of the residual available oxygen in the equipment room at the previous time step is Kg;
Vinis the intake air flow rate, and has the unit of m3/s；
ρinThe unit is Kg/m for the intake air density3；
VroomIs the air volume of the equipment room, and the unit is m3。
(8) And if the fuel is burnt out, calculating the total activity A released by the ignition of the organic phase, and outputting a calculation result.
Total activity A of each radionuclide released by organic phase on firexComprises the following steps:
Figure BDA0002799996210000112
the total activity a of the organic phase on fire release was:
Figure BDA0002799996210000113
wherein X is more than or equal to 1 and less than or equal to X, t is more than 0 and less than or equal to tt，ttThe total time of the organic phase ignition combustion is expressed in s.
It will be appreciated by persons skilled in the art that the apparatus and method of the present invention are not limited to the embodiments described in the detailed description, and the detailed description is for the purpose of explanation and not limitation of the invention. Other embodiments will be apparent to those skilled in the art from the following detailed description, which is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A method for estimating the source term of an organic phase fire accident of a pulse extraction column is characterized by comprising the following steps:
(1) judging whether the pulse extraction column has a fire accident or not, and starting calculation if the pulse extraction column has the fire accident;
(2) acquiring process parameters;
(3) estimating the mass M of the solvent leaked at present according to the data of the pulse extraction column quality on-line monitoring device and the sump liquid level alarm devicef,0And the surface area S of the combustion chamberpool；
(4) Calculating the x-th smoke mass m generated by fuel combustion at the current time stepx,a,t；
(5) Calculating the residual mass m of the x-th smoke filtered by the filter of the exhaust pipeline and settled by the pipeline at the current time stepx,a,t,J；
(6) Calculating the activity A of the released x type of smoke at the current time step after the smoke is filtered by a filter of the exhaust pipeline and is settled by the pipelinex,tAnd the total release activity A of all kinds of smoke at the current time stept；
(7) Judging whether the fuel is burnt out or not, if not, calculating the mass of the residual available oxygen in the equipment room at the current time step
Figure FDA0002799996200000011
And initial available oxygen mass
Figure FDA0002799996200000012
Returning to the step (4) for recalculation;
(8) and if the fuel is burnt out, calculating the total activity A of the organic phase ignition release at all time steps, and finishing the calculation.
2. The method as claimed in claim 1, wherein the start-up modes in step (1) include a manual start-up mode and an automatic start-up mode in which the start-up mode is automatically started up when the combustion of the pulsed extraction column is detected by drift behavior of a process monitoring instrument and a rise in activity of an aerosol in an equipment room.
3. The method for estimating the source item of the organic phase fire accident of the pulse extraction column as recited in claim 1, wherein the process parameters in the step (2) comprise fixed process parameters, real-time process parameters and real-time monitoring parameters.
4. The method as claimed in claim 3, wherein the fixed process parameters include height of the equipment room and volume of the equipment room, the real-time process parameters include volume fraction of tributyl phosphate in the pulsed extraction column and initial mass of organic solvent in the pulsed extraction column in the current process flow, and the real-time monitoring parameters include inlet air flow and outlet air flow of the equipment room.
5. The method for estimating the source term of organic phase fire accident of pulse extraction column as claimed in claim 1, wherein the mass M of solvent currently leaked in step (3)f,0And the surface area S of the combustion chamberpoolThe calculation method comprises the following steps:
Mf,0＝Mo-Ml
Figure FDA0002799996200000021
wherein M is0Is the initial mass of the organic solvent of the pulsed extraction column of the current process flow, M1Is the current residual organic solvent mass of the pulse extraction column, rhofIs the density of the organic solvent, HpoolIs the height of the combustion chamber.
6. The method for estimating the source term of an organic phase fire accident of a pulse extraction column according to claim 1, wherein the specific steps of the step (4) comprise:
(41) calculating the fuel mass loss rate m't
Figure FDA0002799996200000022
Where t is the current time step, hcFor combustion convection heat flux density, hfFor combustion of radiant heat flux, hrIs the surface radiant heat flux, hlFor latent heat of vaporization of fuel, TtFor the solution temperature at the current time step, cf(Tt) Is the heat capacity of the fuel, TbIs the boiling point of the fuel, T∞In order to be at an infinite space temperature,
Figure FDA0002799996200000023
is the mass ratio of nitrate solution;
(42) calculating the fuel combustion mass m at the current time steptWith the mass of oxygen consumed by combustion of the fuel
Figure FDA0002799996200000024
mt＝m″t·Δt·Spool
Figure FDA0002799996200000025
Wherein, Δ t is the current time step duration,
Figure FDA0002799996200000026
mass of oxygen consumed for combustion of a unit mass of fuel;
(43) calculating the total heat quantity Q generated by combustiontAnd the solution temperature T of the next time stept+1
Qt＝amtht
Figure FDA0002799996200000027
Wherein a is the heat release efficiency, htAs heat of combustion of fuel, MroomAll the equipment quality (including iron on the ground, wall surface and the like) of the equipment room, cs(Tt) The heat capacity of steel is adopted;
(44) calculating mass fraction omega of fuel combustion at the current time stept
Figure FDA0002799996200000031
Wherein M isf,tThe initial remaining fuel mass for the current time step,
mass of oxygen consumed by fuel combustion if current time step
Figure FDA0002799996200000032
Greater than the current remaining available oxygen mass
Figure 1
The mass of oxygen consumed by the fuel burning at the current time step
Figure FDA0002799996200000034
Equal to the current remaining available oxygen mass
Figure 2
Namely, it is
Figure FDA0002799996200000036
(45) Calculating the x-th smoke mass m generated at the current time stepx,a,t，
mx,a,t＝Mx,t·ωt·γx
Wherein M isx,tIs at presentResidual mass of radionuclide of x type, gamma, at time stepxThe smoke generation rate for the x-th radionuclide.
7. The method for estimating the source term of an organic phase fire accident of a pulse extraction column according to claim 1, wherein the concrete steps of the step (5) comprise:
(51) calculating the residual smoke mass of the smoke before the smoke passes through the jth filter
Figure FDA0002799996200000037
Figure FDA0002799996200000038
Wherein m isx,a,t,j-1The mass of the residual smoke, zeta, of the xth smoke after passing through the jth-1 filterx,jThe deposition rate per unit path of the x type flue gas in the j section of the pipeline, ljIs the length of the pipe before the jth filter;
(52) calculating the x-th smoke mass Deltam filtered by the jth filterx,a,t,j
Figure FDA0002799996200000039
Wherein the content of the first and second substances,
Figure FDA00027999962000000310
the filtering efficiency of the jth filter on the xth type of smoke;
(53) calculating the residual smoke mass m after passing through the jth filterx,a,t,j
Figure FDA00027999962000000311
Wherein, ω isxIs the mass fraction of the x-th radionuclide in the oxide fume;
(54) calculating the effective filter mass m remaining for the jth filterp,t,j
Figure FDA00027999962000000312
Wherein m isp,t-1,jTo provide the effective filtering quality remaining for the time step preceding the jth filter,
Figure FDA00027999962000000313
all the filtered smoke mass for the jth filter;
if the filter has a remaining effective filter mass mp,t,jThe mass of the filtered smoke is less than or equal to the mass of the filtered smoke, and the mass of the filtered smoke is set as the residual effective filtering mass m of the filterp,t,jAnd the filter is failed;
(55) after filtering by J filters and pipeline sedimentation, the residual mass of the x-th smoke at the current time step is mx,a,t,J。
8. The method for estimating the source item of the organic phase fire accident of the pulse extraction column as claimed in claim 1, wherein the activity A of the released x type smoke in the current time step in the step (6)x,tAnd the total release activity A of all kinds of smoke at the current time steptThe calculation method comprises the following steps:
Ax,t＝axmx,a,t,J
Figure FDA0002799996200000041
wherein, axThe specific activity of the X-th radionuclide is more than or equal to 1 and less than or equal to X.
9. The method for estimating the organic phase fire accident origin item of the pulse extraction column according to claim 1, wherein the available oxygen in the equipment room at the current time step in the step (7) is remainedQuality of gas
Figure FDA0002799996200000042
And initial available oxygen mass
Figure FDA0002799996200000043
The calculation method comprises the following steps:
for organic solvents, when the oxygen content in the air reaches eta, the organic solvents cannot be combusted, so that the oxygen content of the exhausted air is assumed to be eta,
Figure FDA0002799996200000044
Figure FDA0002799996200000045
wherein the content of the first and second substances,
Figure FDA0002799996200000046
for the quality of the residual available oxygen in the equipment room at the previous time step, VinIs the inlet air flow, ρinIs the intake density, VroomIs the equipment room air volume.
10. The method for estimating the source term of an organic phase fire accident of a pulse extraction column according to claim 1, wherein the total activity A of the organic phase fire release in all time steps in the step (8) is calculated by:
Figure FDA0002799996200000047
wherein t is more than 0 and less than or equal to tt,ttThe total time for the organic phase to ignite and burn is shown.
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